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123-456: Nevis Labs is a research center owned and operated by Columbia University . It is located in Irvington, New York , on the 60-acre (240,000 m) property originally owned by Col. James Alexander Hamilton , the son of Alexander Hamilton , a graduate of Columbia College . James Hamilton built his mansion on this estate and named it Nevis in honor of the birthplace of his father. The land

246-462: A "full-blown crisis" over tensions stemming from a pro-Palestinian campus occupation . These protests at Columbia sparked similar pro-Palestinian protests at universities across the USA. As the protests expanded in scale and notoriety, students and faculty, including people of Jewish heritage, pushed back against the silencing of anti-Zionist voices and accusations of anti-semitism . This sentiment

369-439: A consequence, a powerful source generating plate motion is the excess density of the oceanic lithosphere sinking in subduction zones. When the new crust forms at mid-ocean ridges, this oceanic lithosphere is initially less dense than the underlying asthenosphere, but it becomes denser with age as it conductively cools and thickens. The greater density of old lithosphere relative to the underlying asthenosphere allows it to sink into

492-459: A diverse range of professional and inter-disciplinary fields. In the aftermath of World War II, the discipline of international relations became a major scholarly focus of the university, and in response, the School of International and Public Affairs was founded in 1946, drawing upon the resources of the faculties of political science, economics, and history. The Columbia University Bicentennial

615-412: A dominant vegetation type of Appalachian Oak ( 104 ) with a dominant vegetation form of Eastern Hardwood Forest ( 25 ). Columbia Transportation is the bus service of the university, operated by Academy Bus Lines . The buses are open to all Columbia faculty, students, Dodge Fitness Center members, and anyone else who holds a Columbia ID card. In addition, all TSC students can ride the buses. In

738-450: A few tens of millions of years. Armed with the knowledge of a new heat source, scientists realized that Earth would be much older, and that its core was still sufficiently hot to be liquid. By 1915, after having published a first article in 1912, Alfred Wegener was making serious arguments for the idea of continental drift in the first edition of The Origin of Continents and Oceans . In that book (re-issued in four successive editions up to

861-652: A joint investigation by the NYPD and Columbia, the school concluded that the chemical substance was a "non-toxic, legal, novelty item". On April 17, 2024, Columbia president Minouche Shafik was questioned by the House Committee on Education and the Workforce on the topic of antisemitism on campus. While Shafik was in Washington, DC, student activists began renewed protests, leading to what CNN described as

984-579: A layer of basalt (sial) underlies the continental rocks. However, based on abnormalities in plumb line deflection by the Andes in Peru, Pierre Bouguer had deduced that less-dense mountains must have a downward projection into the denser layer underneath. The concept that mountains had "roots" was confirmed by George B. Airy a hundred years later, during study of Himalayan gravitation, and seismic studies detected corresponding density variations. Therefore, by

1107-657: A major research university. For much of the 19th century, the university consisted of decentralized and separate faculties specializing in Political Science, Philosophy, and Pure Science. In 1979, these faculties were merged into the Graduate School of Arts and Sciences . In 1991, the faculties of Columbia College, the School of General Studies, the Graduate School of Arts and Sciences, the School of

1230-400: A misnomer as there is no force "pushing" horizontally, indeed tensional features are dominant along ridges. It is more accurate to refer to this mechanism as "gravitational sliding", since the topography across the whole plate can vary considerably and spreading ridges are only the most prominent feature. Other mechanisms generating this gravitational secondary force include flexural bulging of

1353-482: A neighborhood that contains a number of academic institutions. The university owns over 7,800 apartments in Morningside Heights, housing faculty, graduate students, and staff. Almost two dozen undergraduate dormitories (purpose-built or converted) are located on campus or in Morningside Heights. Columbia University has an extensive tunnel system , more than a century old, with the oldest portions predating

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1476-591: A pivotal role in scientific breakthroughs including brain–computer interface ; the laser and maser ; nuclear magnetic resonance ; the first nuclear pile ; the first nuclear fission reaction in the Americas ; the first evidence for plate tectonics and continental drift ; and much of the initial research and planning for the Manhattan Project during World War II . As of December 2021 , its alumni, faculty, and staff have included seven of

1599-544: A revision committee, which was headed by John Jay and Alexander Hamilton. In April of that same year, a new charter was adopted for the college granted the power to a separate board of 24 trustees . For a period in the 1790s, with New York City as the federal and state capital and the country under successive Federalist governments, a revived Columbia thrived under the auspices of Federalists such as Hamilton and Jay. President George Washington and Vice President John Adams , in addition to both houses of Congress attended

1722-558: A secondary phenomenon of this basically vertically oriented mechanism. It finds its roots in the Undation Model of van Bemmelen . This can act on various scales, from the small scale of one island arc up to the larger scale of an entire ocean basin. Alfred Wegener , being a meteorologist , had proposed tidal forces and centrifugal forces as the main driving mechanisms behind continental drift ; however, these forces were considered far too small to cause continental motion as

1845-401: A siege ladder to access the second floor of Hamilton Hall and subsequently removed the demonstrators occupying it, dozens of whom were arrested. The actions taken against the demonstrators by the NYPD in riot armour while clearing Hamilton Hall inspired the rap song 'Hinds Hall' by Macklemore , who described the police as "actors in badges" in the song. In June, the charges against most of

1968-407: A solid crust and mantle and a liquid core, but there seemed to be no way that portions of the crust could move around. Many distinguished scientists of the time, such as Harold Jeffreys and Charles Schuchert , were outspoken critics of continental drift. Despite much opposition, the view of continental drift gained support and a lively debate started between "drifters" or "mobilists" (proponents of

2091-478: A static Earth without moving continents up until the major breakthroughs of the early sixties. Two- and three-dimensional imaging of Earth's interior ( seismic tomography ) shows a varying lateral density distribution throughout the mantle. Such density variations can be material (from rock chemistry), mineral (from variations in mineral structures), or thermal (through thermal expansion and contraction from heat energy). The manifestation of this varying lateral density

2214-412: A student application process characterized by The New York Times as "the first modern college application". The application required a photograph of the applicant, the maiden name of the applicant's mother, and the applicant's religious background. Columbia University is an independent, privately supported, nonsectarian and not-for-profit institution of higher education. Its official corporate name

2337-570: Is Trustees of Columbia University in the City of New York . In 1754, the university's first charter was granted by King George II ; however, its modern charter was first enacted in 1787 and last amended in 1810 by the New York State Legislature. Plate tectonics Plate tectonics (from Latin tectonicus , from Ancient Greek τεκτονικός ( tektonikós )  'pertaining to building')

2460-438: Is mantle convection from buoyancy forces. How mantle convection directly and indirectly relates to plate motion is a matter of ongoing study and discussion in geodynamics. Somehow, this energy must be transferred to the lithosphere for tectonic plates to move. There are essentially two main types of mechanisms that are thought to exist related to the dynamics of the mantle that influence plate motion which are primary (through

2583-402: Is $ 46,516. In 2015–2016, annual undergraduate tuition at Columbia was $ 50,526 with a total cost of attendance of $ 65,860 (including room and board). The college is need-blind for domestic applicants. On April 11, 2007, Columbia University announced a $ 400 million donation from media billionaire alumnus John Kluge to be used exclusively for undergraduate financial aid. The donation is among

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2706-707: Is a third campus on the west bank of the Hudson River , the 157-acre (64 ha) Lamont–Doherty Earth Observatory and Earth Institute in Palisades , New York. A fourth is the 60-acre (24 ha) Nevis Laboratories in Irvington, New York , for the study of particle and motion physics. A satellite site in Paris holds classes at Reid Hall . In 2006, the university established the Office of Environmental Stewardship to initiate, coordinate and implement programs to reduce

2829-627: Is also home to the Radiological Research Accelerator Facility ( RARAF ) a National Institute of Biomedical Imaging and Bioengineering biotechnology resource center (P41) specializing in microbeam technology. The Nevis campus is crossed by the Croton Aqueduct , the first water tunnel supplying New York City and now a popular walking and cycling trail. Columbia University Columbia University , officially Columbia University in

2952-527: Is based on their modes of formation. Oceanic crust is formed at sea-floor spreading centers. Continental crust is formed through arc volcanism and accretion of terranes through plate tectonic processes. Oceanic crust is denser than continental crust because it has less silicon and more of the heavier elements than continental crust . As a result of this density difference, oceanic crust generally lies below sea level , while continental crust buoyantly projects above sea level. Average oceanic lithosphere

3075-461: Is called a plate boundary . Plate boundaries are where geological events occur, such as earthquakes and the creation of topographic features such as mountains , volcanoes , mid-ocean ridges , and oceanic trenches . The vast majority of the world's active volcanoes occur along plate boundaries, with the Pacific plate's Ring of Fire being the most active and widely known. Some volcanoes occur in

3198-533: Is called the geosynclinal theory . Generally, this was placed in the context of a contracting planet Earth due to heat loss in the course of a relatively short geological time. It was observed as early as 1596 that the opposite coasts of the Atlantic Ocean—or, more precisely, the edges of the continental shelves —have similar shapes and seem to have once fitted together. Since that time many theories were proposed to explain this apparent complementarity, but

3321-534: Is centered on the front steps of Low Memorial Library . The statue represents a personification of the traditional image of the university as an alma mater , or "nourishing mother", draped in an academic gown and seated on a throne. She wears a laurel wreath on her head and holds in her right hand a scepter capped by a King's Crown, a traditional symbol of the university. A book, representing learning, rests on her lap. The arms of her throne end in lamps, representing "Sapientia et Doctrina", or "Wisdom and Learning"; on

3444-492: Is in motion, presents a problem. The same holds for the African, Eurasian , and Antarctic plates. Gravitational sliding away from mantle doming: According to older theories, one of the driving mechanisms of the plates is the existence of large scale asthenosphere/mantle domes which cause the gravitational sliding of lithosphere plates away from them (see the paragraph on Mantle Mechanisms). This gravitational sliding represents

3567-408: Is invoked as the major driving force, through slab pull along subduction zones. Gravitational sliding away from a spreading ridge is one of the proposed driving forces, it proposes plate motion is driven by the higher elevation of plates at ocean ridges. As oceanic lithosphere is formed at spreading ridges from hot mantle material, it gradually cools and thickens with age (and thus adds distance from

3690-591: Is ranked fourth overall and second among university hospitals. Columbia's medical school has a strategic partnership with New York State Psychiatric Institute , and is affiliated with 19 other hospitals in the U.S. and four hospitals in other countries. Health-related schools are located at the Columbia University Medical Center , a 20-acre (8.1 ha) campus located in the neighborhood of Washington Heights , fifty blocks uptown. Other teaching hospitals affiliated with Columbia through

3813-415: Is still advocated to explain the break-up of supercontinents during specific geological epochs. It has followers amongst the scientists involved in the theory of Earth expansion . Another theory is that the mantle flows neither in cells nor large plumes but rather as a series of channels just below Earth's crust, which then provide basal friction to the lithosphere. This theory, called "surge tectonics",

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3936-726: Is the Henry Hudson Parkway ( NY 9A ) to the west of the campus. It is located 3.4 miles (5.5 km) south of the George Washington Bridge . Columbia University received 60,551 applications for the class of 2025 (entering 2021) and a total of around 2,218 were admitted to the two schools for an overall acceptance rate of 3.66%. Columbia is a racially diverse school, with approximately 52% of all students identifying themselves as persons of color. Additionally, 50% of all undergraduates received grants from Columbia. The average grant size awarded to these students

4059-576: Is the scientific theory that Earth 's lithosphere comprises a number of large tectonic plates , which have been slowly moving since 3–4 billion years ago. The model builds on the concept of continental drift , an idea developed during the first decades of the 20th century. Plate tectonics came to be accepted by geoscientists after seafloor spreading was validated in the mid-to-late 1960s. The processes that result in plates and shape Earth's crust are called tectonics . Tectonic plates also occur in other planets and moons. Earth's lithosphere,

4182-488: Is to consider the relative rate at which each plate is moving as well as the evidence related to the significance of each process to the overall driving force on the plate. One of the most significant correlations discovered to date is that lithospheric plates attached to downgoing (subducting) plates move much faster than other types of plates. The Pacific plate, for instance, is essentially surrounded by zones of subduction (the so-called Ring of Fire) and moves much faster than

4305-407: Is typically 100 km (62 mi) thick. Its thickness is a function of its age. As time passes, it cools by conducting heat from below, and releasing it raditively into space. The adjacent mantle below is cooled by this process and added to its base. Because it is formed at mid-ocean ridges and spreads outwards, its thickness is therefore a function of its distance from the mid-ocean ridge where it

4428-435: Is used. It asserts that super plumes rise from the deeper mantle and are the drivers or substitutes of the major convection cells. These ideas find their roots in the early 1930s in the works of Beloussov and van Bemmelen , which were initially opposed to plate tectonics and placed the mechanism in a fixed frame of vertical movements. Van Bemmelen later modified the concept in his "Undation Models" and used "Mantle Blisters" as

4551-567: The Appalachian Mountains of North America are very similar in structure and lithology . However, his ideas were not taken seriously by many geologists, who pointed out that there was no apparent mechanism for continental drift. Specifically, they did not see how continental rock could plow through the much denser rock that makes up oceanic crust. Wegener could not explain the force that drove continental drift, and his vindication did not come until after his death in 1930. As it

4674-587: The Common Application . The policy change made Columbia one of the last major academic institutions and the last Ivy League university to switch to the Common Application. Scholarships are also given to undergraduate students by the admissions committee. Designations include John W. Kluge Scholars, John Jay Scholars, C. Prescott Davis Scholars, Global Scholars, Egleston Scholars, and Science Research Fellows. Named scholars are selected by

4797-703: The Founding Fathers of the United States of America; four U.S. presidents ; 34 foreign heads of state or government ; two secretaries-general of the United Nations; ten justices of the United States Supreme Court ; 103 Nobel laureates ; 125 National Academy of Sciences members; 53 living billionaires; 23 Olympic medalists ; 33 Academy Award winners ; and 125 Pulitzer Prize recipients. Discussions regarding

4920-635: The Israel–Hamas war , with counter-protests from pro- Israel activists. The students were protesting against the alleged genocide of Palestinians in Gaza by the IDF , with significant faculty support for the protests. Protestors were reported to have yelled “October 7th is going to be every day for you,” toward Jewish students. In January 2024, students who were former IDF soldiers were accused of attacking pro-Palestine demonstrators with noxious chemicals in what

5043-743: The Lamont–Doherty Earth Observatory , the Goddard Institute for Space Studies , and accelerator laboratories with Big Tech firms such as Amazon and IBM . Columbia is a founding member of the Association of American Universities and was the first school in the United States to grant the MD degree . The university also administers and annually awards the Pulitzer Prize . Columbia scientists and scholars have played

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5166-541: The Manhattan Project , creating the first nuclear fission reactor in the Americas and researching gaseous diffusion . In 1928, Seth Low Junior College was established by Columbia University in order to mitigate the number of Jewish applicants to Columbia College. The college was closed in 1936 due to the adverse effects of the Great Depression and its students were subsequently taught at Morningside Heights, although they did not belong to any college but to

5289-553: The New York City Subway , the [REDACTED] train serves the university at 116th Street-Columbia University . The M4 , M104 and M60 buses stop on Broadway while the M11 stops on Amsterdam Avenue. The main campus is primarily boxed off by the streets of Amsterdam Avenue, Broadway , 114th street, and 120th street, with some buildings, including Barnard College, located just outside the area. The nearest major highway

5412-476: The Upper Manhattan neighborhood of Morningside Heights on Seth Low 's late-19th century vision of a university campus where all disciplines could be taught at one location. The campus was designed along Beaux-Arts planning principles by the architects McKim, Mead & White . Columbia's main campus occupies more than six city blocks , or 32 acres (13 ha), in Morningside Heights, New York City,

5535-422: The chemical subdivision of these same layers into the mantle (comprising both the asthenosphere and the mantle portion of the lithosphere) and the crust: a given piece of mantle may be part of the lithosphere or the asthenosphere at different times depending on its temperature and pressure. The key principle of plate tectonics is that the lithosphere exists as separate and distinct tectonic plates , which ride on

5658-736: The fluid-like solid the asthenosphere . Plate motions range from 10 to 40 millimetres per year (0.4 to 1.6 in/year) at the Mid-Atlantic Ridge (about as fast as fingernails grow), to about 160 millimetres per year (6.3 in/year) for the Nazca plate (about as fast as hair grows). Tectonic lithosphere plates consist of lithospheric mantle overlain by one or two types of crustal material: oceanic crust (in older texts called sima from silicon and magnesium ) and continental crust ( sial from silicon and aluminium ). The distinction between oceanic crust and continental crust

5781-473: The lithosphere and asthenosphere . The division is based on differences in mechanical properties and in the method for the transfer of heat . The lithosphere is cooler and more rigid, while the asthenosphere is hotter and flows more easily. In terms of heat transfer, the lithosphere loses heat by conduction , whereas the asthenosphere also transfers heat by convection and has a nearly adiabatic temperature gradient. This division should not be confused with

5904-653: The "Urban Beach", are a popular meeting area for Columbia students. The term refers to the long series of granite steps leading from the lower part of campus (South Field) to its upper terrace. In April 2007, the university purchased more than two-thirds of a 17 acres (6.9 ha) site for a new campus in Manhattanville , an industrial neighborhood to the north of the Morningside Heights campus. Stretching from 125th Street to 133rd Street , Columbia Manhattanville houses buildings for Columbia's Business School, School of International and Public Affairs, Columbia School of

6027-532: The Arts , and the School of Professional Studies were merged into the Faculty of Arts and Sciences, leading to the academic integration and centralized governance of these schools. In 2010, the School of International and Public Affairs , which was previously a part of the Faculty of Arts and Sciences, became an independent faculty. In fall of 2023, pro-Palestine student activists organized protests in response to

6150-744: The Arts, and the Jerome L. Greene Center for Mind, Brain, and Behavior, where research will occur on neurodegenerative diseases such as Parkinson's and Alzheimer's. The $ 7 billion expansion plan included demolishing all buildings, except three that are historically significant (the Studebaker Building , Prentis Hall , and the Nash Building), eliminating the existing light industry and storage warehouses, and relocating tenants in 132 apartments. Replacing these buildings created 6.8 million square feet (630,000 m ) of space for

6273-574: The City of New York , is a private Ivy League research university in New York City . Established in 1754 as King's College on the grounds of Trinity Church in Manhattan , it is the oldest institution of higher education in New York and the fifth-oldest in the United States . Columbia was established as a colonial college by royal charter under George II of Great Britain . It

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6396-598: The Earth's rotation and the Moon as main driving forces for the plates. The vector of a plate's motion is a function of all the forces acting on the plate; however, therein lies the problem regarding the degree to which each process contributes to the overall motion of each tectonic plate. The diversity of geodynamic settings and the properties of each plate result from the impact of the various processes actively driving each individual plate. One method of dealing with this problem

6519-461: The King's College campus at Park Place to a primarily Gothic Revival campus on 49th Street and Madison Avenue , where it remained for the next forty years. During the last half of the 19th century, under the presidency of Frederick A. P. Barnard , for whom Barnard College is named, the institution rapidly assumed the shape of a modern university. Barnard College was created in 1889 as a response to

6642-816: The NewYork-Presbyterian network include the Payne Whitney Clinic in Manhattan, and the Payne Whitney Westchester, a psychiatric institute located in White Plains, New York. On the northern tip of Manhattan island (in the neighborhood of Inwood ), Columbia owns the 26-acre (11 ha) Baker Field, which includes the Lawrence A. Wien Stadium as well as facilities for field sports, outdoor track, and tennis. There

6765-572: The United States. In 1763, Johnson was succeeded in the presidency by Myles Cooper , a graduate of The Queen's College, Oxford , and an ardent Tory . In the charged political climate of the American Revolution , his chief opponent in discussions at the college was an undergraduate of the class of 1777, Alexander Hamilton . The Irish anatomist, Samuel Clossy , was appointed professor of natural philosophy in October 1765 and later

6888-538: The United States. Several buildings on the Morningside Heights campus are listed on the National Register of Historic Places . Low Memorial Library , a National Historic Landmark and the centerpiece of the campus, is listed for its architectural significance. Philosophy Hall is listed as the site of the invention of FM radio . Also listed is Pupin Hall , another National Historic Landmark , which houses

7011-541: The actual motions of the Pacific plate and other plates associated with the East Pacific Rise do not correlate mainly with either slab pull or slab push, but rather with a mantle convection upwelling whose horizontal spreading along the bases of the various plates drives them along via viscosity-related traction forces. The driving forces of plate motion continue to be active subjects of on-going research within geophysics and tectonophysics . The development of

7134-411: The admission committee from first-year applicants. According to Columbia, the first four designated scholars "distinguish themselves for their remarkable academic and personal achievements, dynamism, intellectual curiosity, the originality and independence of their thinking, and the diversity that stems from their different cultures and their varied educational experiences". In 1919, Columbia established

7257-478: The assumption of a solid Earth made these various proposals difficult to accept. The discovery of radioactivity and its associated heating properties in 1895 prompted a re-examination of the apparent age of Earth . This had previously been estimated by its cooling rate under the assumption that Earth's surface radiated like a black body . Those calculations had implied that, even if it started at red heat , Earth would have dropped to its present temperature in

7380-399: The asthenosphere. This theory was launched by Arthur Holmes and some forerunners in the 1930s and was immediately recognized as the solution for the acceptance of the theory as originally discussed in the papers of Alfred Wegener in the early years of the 20th century. However, despite its acceptance, it was long debated in the scientific community because the leading theory still envisaged

7503-469: The back of the throne is embossed an image of the seal of the university . The small hidden owl on the sculpture is also the subject of many Columbia legends, the main legend being that the first student in the freshmen class to find the hidden owl on the statue will be valedictorian, and that any subsequent Columbia male who finds it will marry a Barnard student, given that Barnard is a women's college . "The Steps", alternatively known as "Low Steps" or

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7626-476: The base of the lithosphere. Slab pull is therefore most widely thought to be the greatest force acting on the plates. In this understanding, plate motion is mostly driven by the weight of cold, dense plates sinking into the mantle at trenches. Recent models indicate that trench suction plays an important role as well. However, the fact that the North American plate is nowhere being subducted, although it

7749-495: The bathymetry of the deep ocean floors and the nature of the oceanic crust such as magnetic properties and, more generally, with the development of marine geology which gave evidence for the association of seafloor spreading along the mid-oceanic ridges and magnetic field reversals , published between 1959 and 1963 by Heezen, Dietz, Hess, Mason, Vine & Matthews, and Morley. Simultaneous advances in early seismic imaging techniques in and around Wadati–Benioff zones along

7872-474: The college's commencement on May 6, 1789, as a tribute of honor to the many alumni of the school who had been involved in the American Revolution . In November 1813, the college agreed to incorporate its medical school with The College of Physicians and Surgeons, a new school created by the Regents of New York, forming Columbia University College of Physicians and Surgeons . In 1857, the college moved from

7995-479: The college's first professor of anatomy in 1767. The American Revolutionary War broke out in 1776, and was catastrophic for the operation of King's College, which suspended instruction for eight years beginning in 1776 with the arrival of the Continental Army . The suspension continued through the military occupation of New York City by British troops until their departure in 1783. The college's library

8118-413: The concept was of continents plowing through oceanic crust. Therefore, Wegener later changed his position and asserted that convection currents are the main driving force of plate tectonics in the last edition of his book in 1929. However, in the plate tectonics context (accepted since the seafloor spreading proposals of Heezen, Hess, Dietz, Morley, Vine, and Matthews (see below) during the early 1960s),

8241-415: The deep mantle at subduction zones, providing most of the driving force for plate movement. The weakness of the asthenosphere allows the tectonic plates to move easily towards a subduction zone. For much of the first quarter of the 20th century, the leading theory of the driving force behind tectonic plate motions envisaged large scale convection currents in the upper mantle, which can be transmitted through

8364-534: The discussions treated in this section) or proposed as minor modulations within the overall plate tectonics model. In 1973, George W. Moore of the USGS and R. C. Bostrom presented evidence for a general westward drift of Earth's lithosphere with respect to the mantle, based on the steepness of the subduction zones (shallow dipping towards the east, steeply dipping towards the west). They concluded that tidal forces (the tidal lag or "friction") caused by Earth's rotation and

8487-466: The driving force for horizontal movements, invoking gravitational forces away from the regional crustal doming. The theories find resonance in the modern theories which envisage hot spots or mantle plumes which remain fixed and are overridden by oceanic and continental lithosphere plates over time and leave their traces in the geological record (though these phenomena are not invoked as real driving mechanisms, but rather as modulators). The mechanism

8610-400: The entire university community" and was carried out by both faculty and students. The task force on anti-semitism was criticised by a group of 24 Jewish faculty (as well as 16 non-Jewish faculty) and Jewish students for misrepresentations, omission of key context and equating anti-Zionism with antisemitism. The majority of Columbia's graduate and undergraduate studies are conducted in

8733-479: The fall of 1983, after a decade of failed negotiations with Barnard College , the all-female institution affiliated with the university, to merge the two schools. Barnard College still remains affiliated with Columbia, and all Barnard graduates are issued diplomas signed by the presidents of Columbia University and Barnard College. During the late 20th century, the university underwent significant academic, structural, and administrative changes as it developed into

8856-473: The final one in 1936), he noted how the east coast of South America and the west coast of Africa looked as if they were once attached. Wegener was not the first to note this ( Abraham Ortelius , Antonio Snider-Pellegrini , Eduard Suess , Roberto Mantovani and Frank Bursley Taylor preceded him just to mention a few), but he was the first to marshal significant fossil and paleo-topographical and climatological evidence to support this simple observation (and

8979-695: The forces acting upon it by the Moon are a driving force for plate tectonics. As Earth spins eastward beneath the Moon, the Moon's gravity ever so slightly pulls Earth's surface layer back westward, just as proposed by Alfred Wegener (see above). Since 1990 this theory is mainly advocated by Doglioni and co-workers ( Doglioni 1990 ), such as in a more recent 2006 study, where scientists reviewed and advocated these ideas. It has been suggested in Lovett (2006) that this observation may also explain why Venus and Mars have no plate tectonics, as Venus has no moon and Mars' moons are too small to have significant tidal effects on

9102-572: The founding of a college in the Province of New York began as early as 1704. Classes were initially held in July 1754 and were presided over by the college's first president, Samuel Johnson . The college was officially founded on October 31, 1754, as King's College by royal charter of George II , making it the oldest institution of higher learning in the State of New York and the fifth oldest in

9225-588: The geographical latitudinal and longitudinal grid of Earth itself. These systematic relations studies in the second half of the nineteenth century and the first half of the twentieth century underline exactly the opposite: that the plates had not moved in time, that the deformation grid was fixed with respect to Earth's equator and axis, and that gravitational driving forces were generally acting vertically and caused only local horizontal movements (the so-called pre-plate tectonic, "fixist theories"). Later studies (discussed below on this page), therefore, invoked many of

9348-473: The interim provost Dennis Mitchell said was “what appears to have been serious crimes, possibly hate crimes”. One of the students suspected in the attack was initially placed on interim suspension before later being suspended through May 2025. In April 2024, the suspended student sued Columbia, alleging that the school subjected him to "biased misconduct proceedings" and that he had used fart sprays such as " Liquid Ass " rather than harmful chemicals. Following

9471-718: The interiors of plates, and these have been variously attributed to internal plate deformation and to mantle plumes. Tectonic plates may include continental crust or oceanic crust, or both. For example, the African plate includes the continent and parts of the floor of the Atlantic and Indian Oceans. Some pieces of oceanic crust, known as ophiolites , failed to be subducted under continental crust at destructive plate boundaries; instead these oceanic crustal fragments were pushed upward and were preserved within continental crust. Three types of plate boundaries exist, characterized by

9594-412: The large scale convection cells) or secondary. The secondary mechanisms view plate motion driven by friction between the convection currents in the asthenosphere and the more rigid overlying lithosphere. This is due to the inflow of mantle material related to the downward pull on plates in subduction zones at ocean trenches. Slab pull may occur in a geodynamic setting where basal tractions continue to act on

9717-472: The largest single gifts to higher education. However, this does not apply to international students, transfer students, visiting students, or students in the School of General Studies. In the fall of 2010, admission to Columbia's undergraduate colleges Columbia College and the Fu Foundation School of Engineering and Applied Science (also known as SEAS or Columbia Engineering) began accepting

9840-421: The lithosphere before it dives underneath an adjacent plate, producing a clear topographical feature that can offset, or at least affect, the influence of topographical ocean ridges. Mantle plumes and hot spots are also postulated to impinge on the underside of tectonic plates. Slab pull : Scientific opinion is that the asthenosphere is insufficiently competent or rigid to directly cause motion by friction along

9963-403: The lower mantle, there is a slight westward component in the motions of all the plates. They demonstrated though that the westward drift, seen only for the past 30 Ma, is attributed to the increased dominance of the steadily growing and accelerating Pacific plate. The debate is still open, and a recent paper by Hofmeister et al. (2022) revived the idea advocating again the interaction between

10086-405: The many geographical, geological, and biological continuities between continents. In 1912, the meteorologist Alfred Wegener described what he called continental drift, an idea that culminated fifty years later in the modern theory of plate tectonics. Wegener expanded his theory in his 1915 book The Origin of Continents and Oceans . Starting from the idea (also expressed by his forerunners) that

10209-429: The matching of the rock formations along these edges. Confirmation of their previous contiguous nature also came from the fossil plants Glossopteris and Gangamopteris , and the therapsid or mammal-like reptile Lystrosaurus , all widely distributed over South America, Africa, Antarctica, India, and Australia. The evidence for such an erstwhile joining of these continents was patent to field geologists working in

10332-568: The motion picture of the Atlantic region", processes that anticipated seafloor spreading and subduction . One of the first pieces of geophysical evidence that was used to support the movement of lithospheric plates came from paleomagnetism . This is based on the fact that rocks of different ages show a variable magnetic field direction, evidenced by studies since the mid–nineteenth century. The magnetic north and south poles reverse through time, and, especially important in paleotectonic studies,

10455-438: The motion. At a subduction zone the relatively cold, dense oceanic crust sinks down into the mantle, forming the downward convecting limb of a mantle cell , which is the strongest driver of plate motion. The relative importance and interaction of other proposed factors such as active convection, upwelling inside the mantle, and tidal drag of the Moon is still the subject of debate. The outer layers of Earth are divided into

10578-512: The multiversity model that later universities would adopt. Prior to becoming the president of Columbia University, Butler founded Teachers College , as a school to prepare home economists and manual art teachers for the children of the poor, with philanthropist Grace Hoadley Dodge . Teachers College is currently affiliated as the university's Graduate School of Education. In the 1940s, faculty members, including John R. Dunning , I. I. Rabi , Enrico Fermi , and Polykarp Kusch , began what became

10701-533: The new Republic, the legislature stipulated that "the College within the City of New York heretofore called King's College be forever hereafter called and known by the name of Columbia College ", a reference to Columbia , an alternative name for America which in turn comes from the name of Christopher Columbus . The Regents finally became aware of the college's defective constitution in February 1787 and appointed

10824-470: The north pole, and each continent, in fact, shows its own "polar wander path". During the late 1950s, it was successfully shown on two occasions that these data could show the validity of continental drift: by Keith Runcorn in a paper in 1956, and by Warren Carey in a symposium held in March 1956. The second piece of evidence in support of continental drift came during the late 1950s and early 60s from data on

10947-407: The oceanic crust is suggested to be in motion with the continents which caused the proposals related to Earth rotation to be reconsidered. In more recent literature, these driving forces are: Forces that are small and generally negligible are: For these mechanisms to be overall valid, systematic relationships should exist all over the globe between the orientation and kinematics of deformation and

11070-437: The oceanic lithosphere and the thicker continental lithosphere, each topped by its own kind of crust. Along convergent plate boundaries , the process of subduction carries the edge of one plate down under the other plate and into the mantle . This process reduces the total surface area (crust) of the Earth. The lost surface is balanced by the formation of new oceanic crust along divergent margins by seafloor spreading, keeping

11193-428: The participants in the occupation of Hamilton Hall were dropped. In mid-August 2024, three deans and Minouche Shafik , the 20th president of the university, resigned in the wake of the campus protests. In late August, the university's antisemitism task force reported that the university had failed to prevent violence and hate or protect Jews in the university . According to the report, antisemitism has "affected

11316-609: The physics and astronomy departments. Here the first experiments on the fission of uranium were conducted by Enrico Fermi . The uranium atom was split there ten days after the world's first atom-splitting in Copenhagen , Denmark. Other buildings listed include Casa Italiana , the Delta Psi, Alpha Chapter building of St. Anthony Hall , Earl Hall , and the buildings of the affiliated Union Theological Seminary . A statue by sculptor Daniel Chester French called Alma Mater

11439-470: The planet. In a paper by it was suggested that, on the other hand, it can easily be observed that many plates are moving north and eastward, and that the dominantly westward motion of the Pacific Ocean basins derives simply from the eastward bias of the Pacific spreading center (which is not a predicted manifestation of such lunar forces). In the same paper the authors admit, however, that relative to

11562-399: The plate as it dives into the mantle (although perhaps to a greater extent acting on both the under and upper side of the slab). Furthermore, slabs that are broken off and sink into the mantle can cause viscous mantle forces driving plates through slab suction. In the theory of plume tectonics followed by numerous researchers during the 1990s, a modified concept of mantle convection currents

11685-426: The plates of the Atlantic basin, which are attached (perhaps one could say 'welded') to adjacent continents instead of subducting plates. It is thus thought that forces associated with the downgoing plate (slab pull and slab suction) are the driving forces which determine the motion of plates, except for those plates which are not being subducted. This view however has been contradicted by a recent study which found that

11808-548: The present campus. Some of these remain accessible to the public, while others have been cordoned off. Butler Library is the largest in the Columbia University Libraries system and one of the largest buildings on the campus. It was completed in 1934 and renamed to Butler Library in 1946. As of 2020 , Columbia's library system includes over 15.0 million volumes, making it the eighth largest library system and fifth largest collegiate library system in

11931-408: The present continents once formed a single land mass (later called Pangaea ), Wegener suggested that these separated and drifted apart, likening them to "icebergs" of low density sial floating on a sea of denser sima . Supporting evidence for the idea came from the dove-tailing outlines of South America's east coast and Africa's west coast Antonio Snider-Pellegrini had drawn on his maps, and from

12054-459: The relationships recognized during this pre-plate tectonics period to support their theories (see reviews of these various mechanisms related to Earth rotation the work of van Dijk and collaborators). Of the many forces discussed above, tidal force is still highly debated and defended as a possible principal driving force of plate tectonics. The other forces are only used in global geodynamic models not using plate tectonics concepts (therefore beyond

12177-428: The relative position of the magnetic north pole varies through time. Initially, during the first half of the twentieth century, the latter phenomenon was explained by introducing what was called "polar wander" (see apparent polar wander ) (i.e., it was assumed that the north pole location had been shifting through time). An alternative explanation, though, was that the continents had moved (shifted and rotated) relative to

12300-399: The ridge). Cool oceanic lithosphere is significantly denser than the hot mantle material from which it is derived and so with increasing thickness it gradually subsides into the mantle to compensate the greater load. The result is a slight lateral incline with increased distance from the ridge axis. This force is regarded as a secondary force and is often referred to as " ridge push ". This is

12423-599: The right to appropriate private property for public use. On May 20, 2009, the New York State Public Authorities Control Board approved the Manhanttanville expansion plan. NewYork-Presbyterian Hospital is affiliated with the medical schools of both Columbia University and Cornell University . According to U.S. News & World Report ' s "2020–21 Best Hospitals Honor Roll and Medical Specialties Rankings", it

12546-614: The rigid outer shell of the planet including the crust and upper mantle , is fractured into seven or eight major plates (depending on how they are defined) and many minor plates or "platelets". Where the plates meet, their relative motion determines the type of plate boundary (or fault ): convergent , divergent , or transform . The relative movement of the plates typically ranges from zero to 10 cm annually. Faults tend to be geologically active, experiencing earthquakes , volcanic activity , mountain-building , and oceanic trench formation. Tectonic plates are composed of

12669-491: The southern hemisphere. The South African Alex du Toit put together a mass of such information in his 1937 publication Our Wandering Continents , and went further than Wegener in recognising the strong links between the Gondwana fragments. Wegener's work was initially not widely accepted, in part due to a lack of detailed evidence but mostly because of the lack of a reasonable physically supported mechanism. Earth might have

12792-481: The theory of plate tectonics was the scientific and cultural change which occurred during a period of 50 years of scientific debate. The event of the acceptance itself was a paradigm shift and can therefore be classified as a scientific revolution, now described as the Plate Tectonics Revolution . Around the start of the twentieth century, various theorists unsuccessfully attempted to explain

12915-502: The theory) and "fixists" (opponents). During the 1920s, 1930s and 1940s, the former reached important milestones proposing that convection currents might have driven the plate movements, and that spreading may have occurred below the sea within the oceanic crust. Concepts close to the elements of plate tectonics were proposed by geophysicists and geologists (both fixists and mobilists) like Vening-Meinesz, Holmes, and Umbgrove. In 1941, Otto Ampferer described, in his publication "Thoughts on

13038-476: The total surface area constant in a tectonic "conveyor belt". Tectonic plates are relatively rigid and float across the ductile asthenosphere beneath. Lateral density variations in the mantle result in convection currents, the slow creeping motion of Earth's solid mantle. At a seafloor spreading ridge , plates move away from the ridge, which is a topographic high, and the newly formed crust cools as it moves away, increasing its density and contributing to

13161-429: The trenches bounding many continental margins, together with many other geophysical (e.g., gravimetric) and geological observations, showed how the oceanic crust could disappear into the mantle, providing the mechanism to balance the extension of the ocean basins with shortening along its margins. All this evidence, both from the ocean floor and from the continental margins, made it clear around 1965 that continental drift

13284-547: The university at large. There was an evening school called University Extension, which taught night classes, for a fee, to anyone willing to attend. In 1947, the program was reorganized as an undergraduate college and designated the School of General Studies in response to the return of GIs after World War II . In 1995, the School of General Studies was again reorganized as a full-fledged liberal arts college for non-traditional students (those who have had an academic break of one year or more, or are pursuing dual-degrees) and

13407-574: The university's environmental footprint. The U.S. Green Building Council selected the university's Manhattanville plan for the Leadership in Energy and Environmental Design (LEED) Neighborhood Design pilot program. Columbia has been rated "B+" by the 2011 College Sustainability Report Card for its environmental and sustainability initiatives. According to the A. W. Kuchler U.S. potential natural vegetation types, Columbia University would have

13530-409: The university's refusal to accept women. In 1896, university president Seth Low moved the campus from 49th Street to its present location, a more spacious campus in the developing neighborhood of Morningside Heights . Under the leadership of Low's successor, Nicholas Murray Butler , who served for over four decades, Columbia rapidly became the nation's major institution for research, setting

13653-557: The university. Community activist groups in West Harlem fought the expansion for reasons ranging from property protection and fair exchange for land, to residents' rights. Subsequent public hearings drew neighborhood opposition. As of December 2008 , the State of New York's Empire State Development Corporation approved use of eminent domain, which, through declaration of Manhattanville's "blighted" status, gives governmental bodies

13776-467: The way the plates move relative to each other. They are associated with different types of surface phenomena. The different types of plate boundaries are: Tectonic plates are able to move because of the relative density of oceanic lithosphere and the relative weakness of the asthenosphere . Dissipation of heat from the mantle is the original source of the energy required to drive plate tectonics through convection or large scale upwelling and doming. As

13899-482: Was celebrated in 1954. During the 1960s, student activism reached a climax with protests in the spring of 1968 , when hundreds of students occupied buildings on campus. The incident forced the resignation of Columbia's president, Grayson Kirk , and the establishment of the University Senate. Though several schools in the university had admitted women for years, Columbia College first admitted women in

14022-731: Was donated to the university by a branch of the DuPont family . Construction of the 400 MeV Nevis synchrocyclotron took place between 1947 and 1949. University president Dwight D. Eisenhower inaugurated the accelerator in June 1950. During its period of operation from 1950 until 1972, it was one of the world's most productive accelerators. Currently the laboratory specializes in the preparation, design, and construction of high-energy particle and nuclear experiments and equipment. These are transported to major laboratories worldwide. The lab also performs data analysis for these experiments. The laboratory

14145-531: Was feasible. The theory of plate tectonics was defined in a series of papers between 1965 and 1967. The theory revolutionized the Earth sciences, explaining a diverse range of geological phenomena and their implications in other studies such as paleogeography and paleobiology . In the late 19th and early 20th centuries, geologists assumed that Earth's major features were fixed, and that most geologic features such as basin development and mountain ranges could be explained by vertical crustal movement, described in what

14268-599: Was formed. For a typical distance that oceanic lithosphere must travel before being subducted, the thickness varies from about 6 km (4 mi) thick at mid-ocean ridges to greater than 100 km (62 mi) at subduction zones. For shorter or longer distances, the subduction zone, and therefore also the mean, thickness becomes smaller or larger, respectively. Continental lithosphere is typically about 200 km (120 mi) thick, though this varies considerably between basins, mountain ranges, and stable cratonic interiors of continents. The location where two plates meet

14391-521: Was fully integrated into Columbia's traditional undergraduate curriculum. The same year, the Division of Special Programs, later called the School of Continuing Education and now the School of Professional Studies , was established to reprise the former role of University Extension. While the School of Professional Studies only offered non-degree programs for lifelong learners and high school students in its earliest stages, it now offers degree programs in

14514-667: Was later repeated in an open letter by Columbia faculty that criticized the findings of the university's antisemitism task force. On April 22, 2024 the university moved all in-person classes online, with President Shafik saying that this decision would "deescalate the rancor and give us all a chance to consider next steps". In late April, several participants in the campus encampment occupied Hamilton Hall . While inside, these protestors overturned furniture, broke windows, and erected barricades. On April 30, Columbia University called New York Police Department to clear Hamilton Hall. Around 9 PM that night, NYPD officers in riot gear used

14637-425: Was looted and its sole building requisitioned for use as a military hospital first by American and then British forces. The legislature agreed to assist the college, and on May 1, 1784, it passed "an Act for granting certain privileges to the College heretofore called King's College". The Act created a board of regents to oversee the resuscitation of King's College, and, in an effort to demonstrate its support for

14760-424: Was observed early that although granite existed on continents, seafloor seemed to be composed of denser basalt , the prevailing concept during the first half of the twentieth century was that there were two types of crust, named "sial" (continental type crust) and "sima" (oceanic type crust). Furthermore, it was supposed that a static shell of strata was present under the continents. It therefore looked apparent that

14883-443: Was popularized during the 1980s and 1990s. Recent research, based on three-dimensional computer modelling, suggests that plate geometry is governed by a feedback between mantle convection patterns and the strength of the lithosphere. Forces related to gravity are invoked as secondary phenomena within the framework of a more general driving mechanism such as the various forms of mantle dynamics described above. In modern views, gravity

15006-528: Was renamed Columbia College in 1784 following the American Revolution , and in 1787 was placed under a private board of trustees headed by former students Alexander Hamilton and John Jay . In 1896, the campus was moved to its current location in Morningside Heights and renamed Columbia University. Columbia is organized into twenty schools, including four undergraduate schools and 16 graduate schools. The university's research efforts include

15129-575: Was supported in this by researchers such as Alex du Toit ). Furthermore, when the rock strata of the margins of separate continents are very similar it suggests that these rocks were formed in the same way, implying that they were joined initially. For instance, parts of Scotland and Ireland contain rocks very similar to those found in Newfoundland and New Brunswick . Furthermore, the Caledonian Mountains of Europe and parts of

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