112-513: The Cape Cod Regional Law Enforcement Council is a regional mutual aid facilitator formed by 43 police agencies in the area on or near Cape Cod , Massachusetts. It pools resources to provide SWAT, a Motor Vehicle Crash Reconstruction Team, a School Resource Officers’ Network and other units in the area. A report from the ACLU of Massachusetts found that the CCRLEC was highly militarized and possessed
224-493: A Lenco BearCat . Agencies that belong to the group include: Cape Cod Cape Cod is a peninsula extending into the Atlantic Ocean from the southeastern corner of Massachusetts , in the northeastern United States. Its historic, maritime character and ample beaches attract heavy tourism during the summer months. The name Cape Cod, coined in 1602 by Bartholomew Gosnold , is the ninth oldest English place-name in
336-424: A cirque landform (alternatively known as a corrie or as a cwm ) – a typically armchair-shaped geological feature (such as a depression between mountains enclosed by arêtes ) – which collects and compresses through gravity the snow that falls into it. This snow accumulates and the weight of the snow falling above compacts it, forming névé (granular snow). Further crushing of the individual snowflakes and squeezing
448-425: A hurricane brings damaging winds and storm surges to the region. Several Category 3 storms have struck Cape Cod since record-keeping began, such as a hurricane in 1869 , the 1938 New England hurricane , and Hurricane Carol in 1954. Strong Category 2 storms, such as the 1869 Saxby Gale , Hurricane Edna in 1954, and Hurricane Bob in 1991, also caused considerable damage. Notable Category 1 storms include
560-522: A glacier is usually assessed by determining the glacier mass balance or observing terminus behavior. Healthy glaciers have large accumulation zones, more than 60% of their area is snow-covered at the end of the melt season, and they have a terminus with a vigorous flow. Following the Little Ice Age 's end around 1850, glaciers around the Earth have retreated substantially . A slight cooling led to
672-601: A glacier may flow into a body of water, it forms only on land and is distinct from the much thinner sea ice and lake ice that form on the surface of bodies of water. On Earth, 99% of glacial ice is contained within vast ice sheets (also known as "continental glaciers") in the polar regions , but glaciers may be found in mountain ranges on every continent other than the Australian mainland, including Oceania's high-latitude oceanic island countries such as New Zealand . Between latitudes 35°N and 35°S, glaciers occur only in
784-411: A glacier via moulins . Streams within or beneath a glacier flow in englacial or sub-glacial tunnels. These tunnels sometimes reemerge at the glacier's surface. Most of the important processes controlling glacial motion occur in the ice-bed contact—even though it is only a few meters thick. The bed's temperature, roughness and softness define basal shear stress, which in turn defines whether movement of
896-400: A home, so they cleared most of Cape Cod of timber early on. They planted familiar crops, but these were unsuited to Cape Cod's thin, glacially derived soils. For instance, much of Eastham was planted with wheat. The settlers practiced the burning of woodlands to release nutrients into the soil. Improper and intensive farming led to erosion and the loss of topsoil. Farmers grazed their cattle on
1008-408: A kilometer per year. Eventually, the ice will be surging fast enough that it begins to thin, as accumulation cannot keep up with the transport. This thinning will increase the conductive heat loss, slowing the glacier and causing freezing. This freezing will slow the glacier further, often until it is stationary, whence the cycle can begin again. The flow of water under the glacial surface can have
1120-521: A lack of significant waterpower in the area. The Cape developed as a large fishing and whaling center as a result, and also because of its geographic position. After 1860 and the opening of the American West , farmers abandoned agriculture on the Cape. By 1950, forests had recovered to an extent not seen since the 18th century. Cape Cod became a summer haven for city dwellers beginning at the end of
1232-404: A large effect on the motion of the glacier itself. Subglacial lakes contain significant amounts of water, which can move fast: cubic kilometers can be transported between lakes over the course of a couple of years. This motion is thought to occur in two main modes: pipe flow involves liquid water moving through pipe-like conduits, like a sub-glacial river; sheet flow involves motion of water in
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#17327796070541344-492: A light tower that was attached directly to – and centered on the roof of – the keeper's dwelling . A stairway to the lantern room was accessible only from the top floor of the house. This came to be known as a Cape Cod style lighthouse, yet today, the only fully intact specimens are on the west coast of the United States. Most of Cape Cod's lighthouses are operated by the U.S. Coast Guard, with some exceptions, such as
1456-460: A lower heat conductance, meaning that the basal temperature is also likely to be higher. Bed temperature tends to vary in a cyclic fashion. A cool bed has a high strength, reducing the speed of the glacier. This increases the rate of accumulation, since newly fallen snow is not transported away. Consequently, the glacier thickens, with three consequences: firstly, the bed is better insulated, allowing greater retention of geothermal heat. Secondly,
1568-530: A maritime radio station communicating to ships at sea using the callsign WCC . WCC supported the communications of Amelia Earhart , Howard Hughes , Admiral Byrd , and the Hindenburg . Marconi chose Chatham due to its vantage point on the Atlantic Ocean, surrounded on three sides by water. Walter Cronkite narrated a 17-minute documentary in 2005 about the history of the Chatham Station. Much of
1680-412: A number of villages; see Barnstable County for a complete list. Barnstable, the most populated municipality on Cape Cod, is the only one to have adopted a city form of government, whose legislative body is an elected 13-member council . However, like other smaller Massachusetts cities, Barnstable retained its "Town of Barnstable" moniker. All of the other towns elect a 5-member Board of Selectmen as
1792-426: A result, the ocean temperatures on the eastern shore of Cape Cod rarely get above 60 °F (16 °C), while along the southern coast ( Nantucket Sound ), water temperatures can sometimes reach 70 °F (21 °C) or higher. The water surrounding Cape Cod moderates winter temperatures nearly enough to extend the humid subtropical climate zone to what could be its northernmost limit in eastern North America, as
1904-571: A summer home in the Gray Gables section of Bourne. Other notable residents of Cape Cod have included actress Julie Harris , US Supreme Court justice Louis Brandeis , figure skater Todd Eldredge , composer and radio personality Canary Burton , and novelists Norman Mailer and Kurt Vonnegut . Influential natives included patriot James Otis , historian and writer Mercy Otis Warren , jurist Lemuel Shaw , and naval officer John Percival . "Lighthouses, from ancient times, have fascinated members of
2016-488: A thin layer. A switch between the two flow conditions may be associated with surging behavior. Indeed, the loss of sub-glacial water supply has been linked with the shut-down of ice movement in the Kamb ice stream. The subglacial motion of water is expressed in the surface topography of ice sheets, which slump down into vacated subglacial lakes. The speed of glacial displacement is partly determined by friction . Friction makes
2128-410: A tremendous impact as the iceberg strikes the water. Tidewater glaciers undergo centuries-long cycles of advance and retreat that are much less affected by climate change than other glaciers. Thermally, a temperate glacier is at a melting point throughout the year, from its surface to its base. The ice of a polar glacier is always below the freezing threshold from the surface to its base, although
2240-449: Is a spit consisting largely of deposited marine sediment that was eroded and transported from farther south along the shore. Those sediments that instead moved south created the islands and shoals of Monomoy. So while other parts of the Cape have dwindled from the action of the waves, these parts of the Cape have grown through the deposition of sediment in just the last 6,000 years. This process continues today. Due to their exposure to
2352-578: Is a concern. In 2023, the state began a nitrogen pollution regulation scheme for Cape Cod and the Islands to address overgrowth of algae, cyanobacteria, and plants. Under the Köppen climate classification , the Cape Cod area has an oceanic climate . Locally, the Cape has a more moderate climate than inland locations in eastern New England. On occasion, it takes the brunt of extreme weather systems such as
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#17327796070542464-518: Is a park encompassing the site of the first two-way transoceanic radio transmission from the United States. ( Theodore Roosevelt used Marconi's equipment for this transmission.) The Kennedy Compound in Hyannis Port was President Kennedy's summer White House during his presidency, and the Kennedy family continues to maintain residences on the compound. President Grover Cleveland maintained
2576-456: Is above or at freezing at the interface and is able to slide at this contact. This contrast is thought to a large extent to govern the ability of a glacier to effectively erode its bed , as sliding ice promotes plucking at rock from the surface below. Glaciers which are partly cold-based and partly warm-based are known as polythermal . Glaciers form where the accumulation of snow and ice exceeds ablation . A glacier usually originates from
2688-407: Is affected by factors such as slope, ice thickness, snowfall, longitudinal confinement, basal temperature, meltwater production, and bed hardness. A few glaciers have periods of very rapid advancement called surges . These glaciers exhibit normal movement until suddenly they accelerate, then return to their previous movement state. These surges may be caused by the failure of the underlying bedrock,
2800-545: Is also known for a delayed spring season due to the sea remaining cold from the winter; by the same token, the summer heat retained in the sea moderates fall temperatures in comparison to the adjacent inland area. The highest temperature yet recorded on the peninsula was 104 °F (40 °C) in Provincetown, the lowest temperature recorded was −12 °F (−24 °C) in Barnstable. Precipitation on Cape Cod and
2912-411: Is because these peaks are located near or in the hyperarid Atacama Desert . Glaciers erode terrain through two principal processes: plucking and abrasion . As glaciers flow over bedrock, they soften and lift blocks of rock into the ice. This process, called plucking, is caused by subglacial water that penetrates fractures in the bedrock and subsequently freezes and expands. This expansion causes
3024-406: Is by basal sliding, where meltwater forms between the ice and the bed itself. Whether a bed is hard or soft depends on the porosity and pore pressure; higher porosity decreases the sediment strength (thus increases the shear stress τ B ). Porosity may vary through a range of methods. Bed softness may vary in space or time, and changes dramatically from glacier to glacier. An important factor
3136-434: Is called glaciology . Glaciers are important components of the global cryosphere . Glaciers are categorized by their morphology, thermal characteristics, and behavior. Alpine glaciers form on the crests and slopes of mountains. A glacier that fills a valley is called a valley glacier , or alternatively, an alpine glacier or mountain glacier . A large body of glacial ice astride a mountain, mountain range, or volcano
3248-416: Is called rock flour and is made up of rock grains between 0.002 and 0.00625 mm in size. Abrasion leads to steeper valley walls and mountain slopes in alpine settings, which can cause avalanches and rock slides, which add even more material to the glacier. Glacial abrasion is commonly characterized by glacial striations . Glaciers produce these when they contain large boulders that carve long scratches in
3360-647: Is higher, and the mountains above 5,000 m (16,400 ft) usually have permanent snow. Even at high latitudes, glacier formation is not inevitable. Areas of the Arctic , such as Banks Island , and the McMurdo Dry Valleys in Antarctica are considered polar deserts where glaciers cannot form because they receive little snowfall despite the bitter cold. Cold air, unlike warm air, is unable to transport much water vapor. Even during glacial periods of
3472-402: Is no tangible support of the presence of Norse voyagers in Cape Cod, and the view is not generally accepted by archaeologists or historians. Giovanni da Verrazzano approached it from the south in 1524. He named Martha's Vineyard Claudia, after Claude of France , the wife of Francis I of France . In 1525, Portuguese explorer Estêvão Gomes called it Cabo de la Arenas while sailing under
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3584-449: Is shown on Southack's map of 1717. The present Cape Cod Canal was slowly developed from 1870 to 1914. The federal government purchased it in 1928. Because of early colonial settlement and intensive land use, the Cape's vegetation was depauperate and trees were scarce by the time that Henry Thoreau saw Cape Cod during his four visits over 1849 to 1857,. The settlers heated by fires, and it took 10 to 20 cords (40 to 80 m ) of wood to heat
3696-897: Is termed an ice cap or ice field . Ice caps have an area less than 50,000 km (19,000 sq mi) by definition. Glacial bodies larger than 50,000 km (19,000 sq mi) are called ice sheets or continental glaciers . Several kilometers deep, they obscure the underlying topography. Only nunataks protrude from their surfaces. The only extant ice sheets are the two that cover most of Antarctica and Greenland. They contain vast quantities of freshwater, enough that if both melted, global sea levels would rise by over 70 m (230 ft). Portions of an ice sheet or cap that extend into water are called ice shelves ; they tend to be thin with limited slopes and reduced velocities. Narrow, fast-moving sections of an ice sheet are called ice streams . In Antarctica, many ice streams drain into large ice shelves . Some drain directly into
3808-413: Is the region where there is a net loss in glacier mass. The upper part of a glacier, where accumulation exceeds ablation, is called the accumulation zone . The equilibrium line separates the ablation zone and the accumulation zone; it is the contour where the amount of new snow gained by accumulation is equal to the amount of ice lost through ablation. In general, the accumulation zone accounts for 60–70% of
3920-402: Is the underlying geology; glacial speeds tend to differ more when they change bedrock than when the gradient changes. Further, bed roughness can also act to slow glacial motion. The roughness of the bed is a measure of how many boulders and obstacles protrude into the overlying ice. Ice flows around these obstacles by melting under the high pressure on their stoss side ; the resultant meltwater
4032-552: Is then forced into the cavity arising in their lee side , where it re-freezes. As well as affecting the sediment stress, fluid pressure (p w ) can affect the friction between the glacier and the bed. High fluid pressure provides a buoyancy force upwards on the glacier, reducing the friction at its base. The fluid pressure is compared to the ice overburden pressure, p i , given by ρgh. Under fast-flowing ice streams, these two pressures will be approximately equal, with an effective pressure (p i – p w ) of 30 kPa; i.e. all of
4144-508: Is to the east of Cape Cod, and to the southwest of the Cape is Buzzards Bay . The Cape Cod Canal, completed in 1916, connects Buzzards Bay to Cape Cod Bay; its creation shortened the trade route between New York and Boston by 62 miles (100 km). Cape Cod extends 65 miles (105 km) into the Atlantic Ocean, with a breadth of between 1–20 miles (1.6–32.2 km), and covers more than 400 miles (640 km) of shoreline. Its elevation ranges from 306 feet (93 m) at its highest point, at
4256-655: The 1944 Great Atlantic hurricane and Hurricane Donna in 1960. Other notable storms include the Gale of 1815 , which would likely have been rated a strong hurricane on the Saffir-Simpson scale, and the so-called " Perfect Storm " of October 31, 1991. The February 2013 nor'easter produced winds in excess of 80 miles per hour (130 km/h) and dropped over 24 inches (61 cm) of snow on some parts of Cape Cod. The storm knocked out power to tens of thousands of Cape Cod residents, some for up to two weeks. Cape Cod has been
4368-993: The Andes , the Himalayas , the Rocky Mountains , the Caucasus , Scandinavian Mountains , and the Alps . Snezhnika glacier in Pirin Mountain, Bulgaria with a latitude of 41°46′09″ N is the southernmost glacial mass in Europe. Mainland Australia currently contains no glaciers, although a small glacier on Mount Kosciuszko was present in the last glacial period . In New Guinea, small, rapidly diminishing, glaciers are located on Puncak Jaya . Africa has glaciers on Mount Kilimanjaro in Tanzania, on Mount Kenya , and in
4480-605: The Blizzard of 2005 and Hurricane Bob . Because of the influence of the Atlantic Ocean on three sides, temperatures are typically a few degrees lower in the summer and often several degrees higher in the winter than the adjacent mainland. Two ocean currents (the Gulf Stream , a warm ocean current from the south, and the Labrador Current , a cold ocean current from the north), meander and interact with each other. As
4592-671: The Bourne Bridge . In addition, the Cape Cod Canal Railroad Bridge carries railway freight and provides limited passenger service onto the Cape. Like Cape Cod itself, the islands south of the Cape have evolved from whaling and trading areas to become resort destinations, attracting wealthy families, celebrities, and tourists. These include the large nearby islands of Nantucket and Martha's Vineyard . Both islands are also famous summer tourist destinations, commonly accessed by ferry from several locations on
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4704-635: The Delineator . Guglielmo Marconi made the first transatlantic wireless transmission originating in the United States from Cape Cod, at Wellfleet . The beach below the bluffs where his station was located is now called Marconi Beach . In 1914, he began construction of a new transatlantic wireless receiver station in Chatham and a companion transmitter station in Marion . In 1920, the stations were acquired by RCA and, in 1921, Chatham began operations as
4816-644: The Faroe and Crozet Islands were completely glaciated. The permanent snow cover necessary for glacier formation is affected by factors such as the degree of slope on the land, amount of snowfall and the winds. Glaciers can be found in all latitudes except from 20° to 27° north and south of the equator where the presence of the descending limb of the Hadley circulation lowers precipitation so much that with high insolation snow lines reach above 6,500 m (21,330 ft). Between 19˚N and 19˚S, however, precipitation
4928-661: The Gulf of Maine , which extends north-eastward to Nova Scotia . Since 1914, most of Cape Cod has been separated from the mainland by the Cape Cod Canal . The canal cuts 7 miles (11 km) roughly across the base of the peninsula, though small portions of the Cape Cod towns of Bourne and Sandwich lie on the mainland side of the canal. Two highway bridges cross the Cape Cod Canal: the Sagamore Bridge and
5040-760: The Himalayas , Andes , and a few high mountains in East Africa, Mexico, New Guinea and on Zard-Kuh in Iran. With more than 7,000 known glaciers, Pakistan has more glacial ice than any other country outside the polar regions. Glaciers cover about 10% of Earth's land surface. Continental glaciers cover nearly 13 million km (5 million sq mi) or about 98% of Antarctica 's 13.2 million km (5.1 million sq mi), with an average thickness of ice 2,100 m (7,000 ft). Greenland and Patagonia also have huge expanses of continental glaciers. The volume of glaciers, not including
5152-568: The Nauset Light , which has been owned since 1997 by the Cape Cod National Seashore (National Park Service) and operated since 2004 in partnership between that agency and the non-profit Nauset Light Preservation Society. In 1996, both Highland Light and Nauset Light were moved further from the shore because they were each at risk of being lost due to erosion by the sea. Highland Light, then 110 ft (34 m) from
5264-581: The Outer Lands , or more obscurely as the "Isles of Stirling". Geologically speaking, Cape Cod is quite young, having been laid down some 16,000 to 20,000 years ago. Most of Cape Cod's geological history involves the advance and retreat of the Laurentide Ice Sheet in the late Pleistocene geological era and the subsequent changes in sea level. Using radiocarbon dating techniques, researchers have determined that around 23,000 years ago,
5376-562: The Quaternary , Manchuria , lowland Siberia , and central and northern Alaska , though extraordinarily cold, had such light snowfall that glaciers could not form. In addition to the dry, unglaciated polar regions, some mountains and volcanoes in Bolivia, Chile and Argentina are high (4,500 to 6,900 m or 14,800 to 22,600 ft) and cold, but the relative lack of precipitation prevents snow from accumulating into glaciers. This
5488-535: The Rwenzori Mountains . Oceanic islands with glaciers include Iceland, several of the islands off the coast of Norway including Svalbard and Jan Mayen to the far north, New Zealand and the subantarctic islands of Marion , Heard , Grande Terre (Kerguelen) and Bouvet . During glacial periods of the Quaternary, Taiwan , Hawaii on Mauna Kea and Tenerife also had large alpine glaciers, while
5600-448: The 1990s and 2000s. In a study using data from January 1993 through October 2005, more events were detected every year since 2002, and twice as many events were recorded in 2005 as there were in any other year. Ogives or Forbes bands are alternating wave crests and valleys that appear as dark and light bands of ice on glacier surfaces. They are linked to seasonal motion of glaciers; the width of one dark and one light band generally equals
5712-640: The 19th century. Improved rail transportation made the towns of the Upper Cape, such as Bourne and Falmouth , accessible to Bostonians . At the beginning of the twentieth century, the Northeastern mercantile elite built many large, shingled "cottages" along Buzzards Bay . The relaxed summer environment offered by Cape Cod was highlighted by writers including Joseph C. Lincoln , who published novels and countless short stories about Cape Cod folks in popular magazines such as The Saturday Evening Post and
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#17327796070545824-649: The Bourne Bridge to the west, and the Sagamore to the east. The bridges form a bottleneck, resulting in traffic backups of several miles during the tourist season - especially going on-cape at the beginning of the weekend and off-cape at the end of the weekend. The entire Cape is roughly bisected lengthwise by U.S. Route 6 , locally known as the Mid-Cape Highway and officially as the Grand Army of
5936-418: The Cape as an island with regard to disaster preparedness, groundwater management, and the like. Cape Codders tend to refer to the land on the mainland side of the canal as "off-Cape", though the legal delineation of Cape Cod, coincident to the boundaries of Barnstable County, includes portions of the towns of Bourne and Sandwich that are located north of the canal. Cape Cod Bay lies in between Cape Cod and
6048-525: The Northeast, yet they retain much of the early merchant trading and whaling culture. Cape Cod in particular is a popular retirement area; 31.8% of the population of Barnstable County is 65 years old or older., and the average age of residents is the highest of any area in New England . Cape Cod is majority Democrat , but by a smaller margin than the rest of Massachusetts. The bulk of the land in
6160-695: The Republic Highway. Glacial A glacier ( US : / ˈ ɡ l eɪ ʃ ər / ; UK : / ˈ ɡ l æ s i ər , ˈ ɡ l eɪ s i ər / ) is a persistent body of dense ice that is constantly moving downhill under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries . It acquires distinguishing features, such as crevasses and seracs , as it slowly flows and deforms under stresses induced by its weight. As it moves, it abrades rock and debris from its substrate to create landforms such as cirques , moraines , or fjords . Although
6272-631: The Spanish crown. In 1602, Bartholomew Gosnold named the tip Cape Cod, the surviving term and the ninth oldest English place-name in the U.S. Samuel de Champlain charted its sand-silted harbors in 1606, and Henry Hudson landed there in 1609. Captain John Smith noted it on his map of 1614, and at last the Pilgrims entered the "Cape Harbor" and made their first landing near Provincetown on November 11, 1620. They had their first encounter with
6384-744: The Town of Provincetown. No longer in "official" use over the ensuing decades, the name came to mean all of the land east of the Manomet and Scusset rivers – essentially along the line that became the Cape Cod Canal. The creation of the canal separated the majority of the peninsula from the mainland. Most agencies, including the Cape Cod Commission and the Federal Emergency Management Agency (FEMA), treat
6496-418: The U.S. As defined by the Cape Cod Commission 's enabling legislation, Cape Cod is coextensive with Barnstable County, Massachusetts . It extends from Provincetown in the northeast to Woods Hole in the southwest, and is bordered by Plymouth to the northwest. The Cape is divided into fifteen towns , several of which are in turn made up of multiple named villages. Cape Cod forms the southern boundary of
6608-412: The advance of many alpine glaciers between 1950 and 1985, but since 1985 glacier retreat and mass loss has become larger and increasingly ubiquitous. Glaciers move downhill by the force of gravity and the internal deformation of ice. At the molecular level, ice consists of stacked layers of molecules with relatively weak bonds between layers. When the amount of strain (deformation) is proportional to
6720-520: The air from the snow turns it into "glacial ice". This glacial ice will fill the cirque until it "overflows" through a geological weakness or vacancy, such as a gap between two mountains. When the mass of snow and ice reaches sufficient thickness, it begins to move by a combination of surface slope, gravity, and pressure. On steeper slopes, this can occur with as little as 15 m (49 ft) of snow-ice. In temperate glaciers, snow repeatedly freezes and thaws, changing into granular ice called firn . Under
6832-430: The amount of melting at surface of the glacier, the faster the ice will flow. Basal sliding is dominant in temperate or warm-based glaciers. The presence of basal meltwater depends on both bed temperature and other factors. For instance, the melting point of water decreases under pressure, meaning that water melts at a lower temperature under thicker glaciers. This acts as a "double whammy", because thicker glaciers have
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#17327796070546944-713: The annual movement of the glacier. Ogives are formed when ice from an icefall is severely broken up, increasing ablation surface area during summer. This creates a swale and space for snow accumulation in the winter, which in turn creates a ridge. Sometimes ogives consist only of undulations or color bands and are described as wave ogives or band ogives. Glaciers are present on every continent and in approximately fifty countries, excluding those (Australia, South Africa) that have glaciers only on distant subantarctic island territories. Extensive glaciers are found in Antarctica, Argentina, Chile, Canada, Pakistan, Alaska, Greenland and Iceland. Mountain glaciers are widespread, especially in
7056-528: The area is glacial terminal moraine and represents the southernmost extent of glacial coverage in southeast New England; similar glacial formations make up Long Island in New York and Block Island in Rhode Island. The name "Cape Cod", as it was first used in 1602, applied only to the very tip of the peninsula. It remained that way for 125 years until the "Precinct of Cape Cod" was incorporated as
7168-432: The bedrock has frequent fractures on the surface, glacial erosion rates tend to increase as plucking is the main erosive force on the surface; when the bedrock has wide gaps between sporadic fractures, however, abrasion tends to be the dominant erosive form and glacial erosion rates become slow. Glaciers in lower latitudes tend to be much more erosive than glaciers in higher latitudes, because they have more meltwater reaching
7280-445: The bedrock. By mapping the direction of the striations, researchers can determine the direction of the glacier's movement. Similar to striations are chatter marks , lines of crescent-shape depressions in the rock underlying a glacier. They are formed by abrasion when boulders in the glacier are repeatedly caught and released as they are dragged along the bedrock. The rate of glacier erosion varies. Six factors control erosion rate: When
7392-527: The cape. The phrases Cape Cod and the Islands and the Cape and Islands are often used to describe the whole region of Barnstable County, Dukes County (including Martha's Vineyard and the smaller Elizabeth Islands ), and Nantucket County. Several small islands right off Cape Cod, including Monomoy Island , Monomoscoy Island , Popponesset Island , and Seconsett Island , are also in Barnstable County. The Forbes family -owned Naushon Island
7504-565: The coast with no obstruction. Consequently, the sediment and sand from the beaches are being washed away and deposited elsewhere. While this destroys land in some places, it creates land elsewhere, most noticeably in marshes where sediment is deposited by flowing water. Cape Cod's aquifer consists of six hydrologically independent lenses from which all the towns on the Cape obtain drinking water (except Falmouth, which, in 2015, drew 43.5% of its water from Long Pond). Contamination with industrial chemicals and pharmaceutical drugs from septic systems
7616-571: The created ice's density. The word glacier is a loanword from French and goes back, via Franco-Provençal , to the Vulgar Latin glaciārium , derived from the Late Latin glacia , and ultimately Latin glaciēs , meaning "ice". The processes and features caused by or related to glaciers are referred to as glacial. The process of glacier establishment, growth and flow is called glaciation . The corresponding area of study
7728-467: The deep profile of fjords , which can reach a kilometer in depth as ice is topographically steered into them. The extension of fjords inland increases the rate of ice sheet thinning since they are the principal conduits for draining ice sheets. It also makes the ice sheets more sensitive to changes in climate and the ocean. Although evidence in favor of glacial flow was known by the early 19th century, other theories of glacial motion were advanced, such as
7840-483: The deformation to become a plastic flow rather than elastic. Then, the glacier will begin to deform under its own weight and flow across the landscape. According to the Glen–Nye flow law , the relationship between stress and strain, and thus the rate of internal flow, can be modeled as follows: where: The lowest velocities are near the base of the glacier and along valley sides where friction acts against flow, causing
7952-431: The early 20th century) is claimed by some to have been visited by Leif Eiriksson , and a stone wall discovered in Provincetown in 1805 is also claimed to have been built by his younger brother Thorvald Eiriksson around AD 1007, when the keel of his ship was repaired in the harbor, according to Norse sagas . He was killed later in the same journey and is said to have been returned to this spot for burial. However, there
8064-529: The east-facing Atlantic seacoast of Cape Cod consists of wide, sandy beaches. In 1961, a significant portion of this coastline, already slated for housing subdivisions, was made a part of the Cape Cod National Seashore by President John F. Kennedy . It was protected from private development and preserved for public use. Large portions are open to the public, including the Marconi Site in Wellfleet . This
8176-418: The essentially correct explanation in the 1840s, although it was several decades before it was fully accepted. The top 50 m (160 ft) of a glacier are rigid because they are under low pressure . This upper section is known as the fracture zone and moves mostly as a single unit over the plastic-flowing lower section. When a glacier moves through irregular terrain, cracks called crevasses develop in
8288-401: The executive policy-setting board and utilize Town Meetings as their legislative body. To the south of Cape Cod lie Nantucket Sound ; Nantucket and Martha's Vineyard , both large islands; and the mostly privately owned Elizabeth Islands . For most of the 18th, 19th, and 20th centuries, Cape Cod was considered to consist of three sections (see map): "East of America, there stands in
8400-590: The federal government in 1975 and again in 1990 for official recognition of the Mashpee Wampanoag as a tribe. In May 2007, the Wampanoag tribe was federally recognized. Cape Cod was a landmark for early explorers. It may have been the "Promontory of Vinland " mentioned by the Norse voyagers (985–1025), although this is disputed. The Manomet River area (taken up by the western end of the Cape Cod Canal in
8512-475: The fracture zone. Crevasses form because of differences in glacier velocity. If two rigid sections of a glacier move at different speeds or directions, shear forces cause them to break apart, opening a crevasse. Crevasses are seldom more than 46 m (150 ft) deep but, in some cases, can be at least 300 m (1,000 ft) deep. Beneath this point, the plasticity of the ice prevents the formation of cracks. Intersecting crevasses can create isolated peaks in
8624-453: The glacier to melt, creating a water source that is especially important for plants, animals and human uses when other sources may be scant. However, within high-altitude and Antarctic environments, the seasonal temperature difference is often not sufficient to release meltwater. Since glacial mass is affected by long-term climatic changes, e.g., precipitation , mean temperature , and cloud cover , glacial mass changes are considered among
8736-428: The glacier will be accommodated by motion in the sediments, or if it'll be able to slide. A soft bed, with high porosity and low pore fluid pressure, allows the glacier to move by sediment sliding: the base of the glacier may even remain frozen to the bed, where the underlying sediment slips underneath it like a tube of toothpaste. A hard bed cannot deform in this way; therefore the only way for hard-based glaciers to move
8848-510: The glacier's surface area, more if the glacier calves icebergs. Ice in the accumulation zone is deep enough to exert a downward force that erodes underlying rock. After a glacier melts, it often leaves behind a bowl- or amphitheater-shaped depression that ranges in size from large basins like the Great Lakes to smaller mountain depressions known as cirques . The accumulation zone can be subdivided based on its melt conditions. The health of
8960-643: The grassy dunes of coastal Massachusetts, only to watch "in horror as the denuded sands 'walked' over richer lands, burying cultivated fields and fences." Dunes on the outer Cape became more common, and many harbors filled in with eroded soils. By 1800, much of Cape Cod's firewood had to be transported by boat from Maine . The paucity of vegetation was worsened by the raising of merino sheep that reached its peak in New England around 1840. The early Industrial Revolution occurred through much of Massachusetts and Rhode Island , but it mostly bypassed Cape Cod due to
9072-438: The home of the indigenous Wampanoag for centuries prior to European colonization . They lived from the sea and were accomplished farmers. They understood the principles of sustainable forest management , and were known to light controlled fires to keep the underbrush in check. They helped the Pilgrims , who arrived in the fall of 1620, survive at their new Plymouth Colony . The Wampanoag gradually lost their lands during
9184-451: The human race. There is something about a lighted beacon that suggests hope and trust and appeals to the better instincts of mankind." Edward Rowe Snow Beginning in 1797, lighthouses were erected along Cape Cod to aid in navigation. Highland Light (or Cape Cod Light) is the oldest and tallest of these, and remains as one of a number of working lighthouses on Cape Cod and the Islands. Many of Cape Cod's earliest lighthouses featured
9296-619: The ice at the bottom of the glacier move more slowly than ice at the top. In alpine glaciers, friction is also generated at the valley's sidewalls, which slows the edges relative to the center. Mean glacial speed varies greatly but is typically around 1 m (3 ft) per day. There may be no motion in stagnant areas; for example, in parts of Alaska, trees can establish themselves on surface sediment deposits. In other cases, glaciers can move as fast as 20–30 m (70–100 ft) per day, such as in Greenland's Jakobshavn Isbræ . Glacial speed
9408-420: The ice sheet reached its maximum southward advance over North America, and then started to retreat. Many kettle ponds – clear, cold lakes – were formed and remain on Cape Cod as a result of the receding glacier. By about 18,000 years ago, the ice sheet had retreated past Cape Cod. By roughly 15,000 years ago, it had retreated past southern New England. With so much of Earth's water locked up in massive ice sheets,
9520-420: The ice sheets of Antarctica and Greenland, has been estimated at 170,000 km . Glacial ice is the largest reservoir of fresh water on Earth, holding with ice sheets about 69 percent of the world's freshwater. Many glaciers from temperate , alpine and seasonal polar climates store water as ice during the colder seasons and release it later in the form of meltwater as warmer summer temperatures cause
9632-556: The ice to act as a lever that loosens the rock by lifting it. Thus, sediments of all sizes become part of the glacier's load. If a retreating glacier gains enough debris, it may become a rock glacier , like the Timpanogos Glacier in Utah. Abrasion occurs when the ice and its load of rock fragments slide over bedrock and function as sandpaper, smoothing and polishing the bedrock below. The pulverized rock this process produces
9744-488: The ice, called seracs . Crevasses can form in several different ways. Transverse crevasses are transverse to flow and form where steeper slopes cause a glacier to accelerate. Longitudinal crevasses form semi-parallel to flow where a glacier expands laterally. Marginal crevasses form near the edge of the glacier, caused by the reduction in speed caused by friction of the valley walls. Marginal crevasses are largely transverse to flow. Moving glacier ice can sometimes separate from
9856-411: The idea that meltwater, refreezing inside glaciers, caused the glacier to dilate and extend its length. As it became clear that glaciers behaved to some degree as if the ice were a viscous fluid, it was argued that "regelation", or the melting and refreezing of ice at a temperature lowered by the pressure on the ice inside the glacier, was what allowed the ice to deform and flow. James Forbes came up with
9968-418: The increased pressure can facilitate melting. Most importantly, τ D is increased. These factors will combine to accelerate the glacier. As friction increases with the square of velocity, faster motion will greatly increase frictional heating, with ensuing melting – which causes a positive feedback, increasing ice speed to a faster flow rate still: west Antarctic glaciers are known to reach velocities of up to
10080-423: The infrared OH stretching mode of the water molecule. (Liquid water appears blue for the same reason. The blue of glacier ice is sometimes misattributed to Rayleigh scattering of bubbles in the ice.) A glacier originates at a location called its glacier head and terminates at its glacier foot, snout, or terminus . Glaciers are broken into zones based on surface snowpack and melt conditions. The ablation zone
10192-407: The islands of Martha's Vineyard and Nantucket is the lowest in the southern New England region, averaging slightly less than 40 inches (100 cm) a year (most parts of New England average 42 to 46 inches (110 to 120 cm)). This is due to the maritime influence inhibiting summertime thunderstorm development and maintenance. The region does not experience a greater number of sunny days, however, as
10304-566: The mainland – bounded on the north by a line between Provincetown and Marshfield . North of Cape Cod Bay (and Provincetown) is Massachusetts Bay , which contains the Stellwagen Bank National Marine Sanctuary , located 5 miles (8 km) north of Provincetown. Cape Cod Bay and Massachusetts Bay are both part of the Gulf of Maine, which includes the waters between the Cape and Nova Scotia. The Atlantic Ocean
10416-679: The most deformation. Velocity increases inward toward the center line and upward, as the amount of deformation decreases. The highest flow velocities are found at the surface, representing the sum of the velocities of all the layers below. Because ice can flow faster where it is thicker, the rate of glacier-induced erosion is directly proportional to the thickness of overlying ice. Consequently, pre-glacial low hollows will be deepened and pre-existing topography will be amplified by glacial action, while nunataks , which protrude above ice sheets, barely erode at all – erosion has been estimated as 5 m per 1.2 million years. This explains, for example,
10528-445: The most sensitive indicators of climate change and are a major source of variations in sea level . A large piece of compressed ice, or a glacier, appears blue , as large quantities of water appear blue , because water molecules absorb other colors more efficiently than blue. The other reason for the blue color of glaciers is the lack of air bubbles. Air bubbles, which give a white color to ice, are squeezed out by pressure increasing
10640-515: The native inhabitants in nearby Eastham . Cape Cod was among the first places settled by Puritan colonists in North America. The Cape's fifteen towns developed slowly, aside from Barnstable (1639), Sandwich (1637), and Yarmouth (1639). The final town to be established on the Cape was Bourne in 1884, breaking off from Sandwich. Provincetown was a group of huts until the 18th century. A channel from Massachusetts Bay to Buzzards Bay
10752-402: The number of cloudy days is the same as inland locales, in addition to increased fog. On average, roughly 27 inches (69 cm) of snow, which is about 17 inches (43 cm) less than Boston, falls in an average winter. Once every five or six years, a tropical storm , accompanied by very high and potentially damaging winds and heavy rain, will strike the region. About once every 11 or 12 years
10864-483: The ocean, was moved 450 ft (140 m) to the west, and Nauset Light, 37 ft (11 m) from the bluff, was moved 300 ft (91 m) west. The lighthouses of Cape Cod include: Cape Cod is connected to the mainland by a pair of canal-spanning highway bridges, the Bourne and Sagamore that were constructed in the 1930s (replacing a 1912 drawbridge). The two parallel road bridges are four miles apart, with
10976-611: The open Atlantic the last fragment of an ancient and vanished land. Worn by the breakers and the rains, and disintegrated by the wind, it still stands bold." Henry Beston , The Outermost House The bulk of the land on Cape Cod consists of glacial landforms , formed by terminal moraine and outwash plains . This represents the southernmost extent of glacial coverage in southeast New England; similar glacial formations make up Long Island in New York and Block Island in Rhode Island . Together, these formations are known as
11088-404: The open ocean, the Cape and islands are subject to considerable coastal erosion . Due to erosion, the Cape will be completely submerged by the sea within several thousand years. This erosion causes the washout of beaches and the destruction of the barrier islands; for example, the ocean broke through the barrier island at Chatham during Hurricane Bob in 1991, allowing waves and storm surge to hit
11200-485: The peninsula is split between USDA hardiness zones 7a (Upper and Mid Cape) and 7b (Lower and Outer Cape). Consequently, many subtropical indicator plant species typically found in more southerly latitudes are grown there, including Camellias , Ilex opaca , Magnolia grandiflora and Albizia julibrissin . However, Cape Cod falls below the 72 °F (22 °C) threshold, as the warmest month, July, averages around 68.25 °F (20.14 °C). Cape Cod's climate
11312-554: The period of European incursion through land cessions and violent conflict with white settlers. The documentary Natives of the Narrowland (1993), narrated by actress Julie Harris , shows the history of the Wampanoag people through Cape Cod archaeological sites. In 1974, the Mashpee Wampanoag Tribal Council was formed to articulate the concerns of those with Native American ancestry. They petitioned
11424-725: The pooling of meltwater at the base of the glacier — perhaps delivered from a supraglacial lake — or the simple accumulation of mass beyond a critical "tipping point". Temporary rates up to 90 m (300 ft) per day have occurred when increased temperature or overlying pressure caused bottom ice to melt and water to accumulate beneath a glacier. In glaciated areas where the glacier moves faster than one km per year, glacial earthquakes occur. These are large scale earthquakes that have seismic magnitudes as high as 6.1. The number of glacial earthquakes in Greenland peaks every year in July, August, and September and increased rapidly in
11536-410: The pressure of the layers of ice and snow above it, this granular ice fuses into denser firn. Over a period of years, layers of firn undergo further compaction and become glacial ice. Glacier ice is slightly more dense than ice formed from frozen water because glacier ice contains fewer trapped air bubbles. Glacial ice has a distinctive blue tint because it absorbs some red light due to an overtone of
11648-402: The sea level was high enough to start eroding the glacial deposits that the vanished continental ice sheet had left on Cape Cod. The water transported the eroded deposits north and south along the outer Cape's shoreline through a process known as longshore drift . Those reworked sediments that moved north went to the tip of Cape Cod. The entire town of Provincetown, at the extreme tip of the Cape,
11760-473: The sea level was lower. Truro's bayside beaches used to be a petrified forest before it became a beach. As the ice began to melt, the sea began to rise. Initially, sea level rose quickly, about 15 metres (49 ft) per 1,000 years, but then the rate declined. On Cape Cod, sea level rose roughly 3 metres (9.8 ft) per millennium between 6,000 and 2,000 years ago. After that, it continued to rise at about 1 metre (3.3 ft) per millennium. By 6,000 years ago,
11872-567: The sea, often with an ice tongue , like Mertz Glacier . Tidewater glaciers are glaciers that terminate in the sea, including most glaciers flowing from Greenland, Antarctica, Baffin , Devon , and Ellesmere Islands in Canada, Southeast Alaska , and the Northern and Southern Patagonian Ice Fields . As the ice reaches the sea, pieces break off or calve, forming icebergs . Most tidewater glaciers calve above sea level, which often results in
11984-409: The stagnant ice above, forming a bergschrund . Bergschrunds resemble crevasses but are singular features at a glacier's margins. Crevasses make travel over glaciers hazardous, especially when they are hidden by fragile snow bridges . Below the equilibrium line, glacial meltwater is concentrated in stream channels. Meltwater can pool in proglacial lakes on top of a glacier or descend into the depths of
12096-423: The stress being applied, ice will act as an elastic solid. Ice needs to be at least 30 m (98 ft) thick to even start flowing, but once its thickness exceeds about 50 m (160 ft) (160 ft), stress on the layer above will exceeds the inter-layer binding strength, and then it'll move faster than the layer below. This means that small amounts of stress can result in a large amount of strain, causing
12208-438: The surface snowpack may experience seasonal melting. A subpolar glacier includes both temperate and polar ice, depending on the depth beneath the surface and position along the length of the glacier. In a similar way, the thermal regime of a glacier is often described by its basal temperature. A cold-based glacier is below freezing at the ice-ground interface and is thus frozen to the underlying substrate. A warm-based glacier
12320-672: The top of Pine Hill , in the Bourne portion of Joint Base Cape Cod , down to sea level. Cape Cod and the Islands form part of a continuous archipelagic region consisting of a chain of islands running from Long Island to the tip of the Cape. This region is historically and collectively known by naturalists as the Outer Lands . Cape Cod incorporates all of Barnstable County, which comprises 15 towns: Bourne , Sandwich , Falmouth , Mashpee , Barnstable , Yarmouth , Harwich , Dennis , Brewster , Chatham , Orleans , Eastham , Wellfleet , Truro , and Provincetown . Each of these towns includes
12432-417: The weight of the ice is supported by the underlying water, and the glacier is afloat. Glaciers may also move by basal sliding , where the base of the glacier is lubricated by the presence of liquid water, reducing basal shear stress and allowing the glacier to slide over the terrain on which it sits. Meltwater may be produced by pressure-induced melting, friction or geothermal heat . The more variable
12544-477: Was first purchased by John Murray Forbes . Naushon is one of the Elizabeth Islands, many of which are privately owned. One of the publicly accessible Elizabeths is the southernmost island in the chain, Cuttyhunk Island , with a year-round population of 52 people. Several prominent families have established compounds or estates on the larger islands, making these islands some of the wealthiest resorts in
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