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103-462: Denali ( / d ə ˈ n ɑː l i / ; also known as Mount McKinley , its former official name) is the highest mountain peak in North America , with a summit elevation of 20,310 feet (6,190 m) above sea level . It is the tallest mountain in the world from base-to-peak on land, measuring 18,000 ft (5,500 m), with a topographic prominence of 20,194 feet (6,155 m) and

206-654: A hill , typically rising at least 300 metres (980  ft ) above the surrounding land. A few mountains are isolated summits , but most occur in mountain ranges . Mountains are formed through tectonic forces , erosion , or volcanism , which act on time scales of up to tens of millions of years. Once mountain building ceases, mountains are slowly leveled through the action of weathering , through slumping and other forms of mass wasting , as well as through erosion by rivers and glaciers . High elevations on mountains produce colder climates than at sea level at similar latitude. These colder climates strongly affect

309-481: A topographic isolation (the distance to the nearest peak of equal or greater height) of 4,621.1 miles (7,436.9 km), Denali is the third most prominent and third-most isolated peak on Earth, after Mount Everest and Aconcagua . Located in the Alaska Range in the interior of the U.S. state of Alaska , Denali is the centerpiece of Denali National Park and Preserve . The Koyukon people who inhabit

412-619: A Fairbanks tavern. By March 1910, the men had established a base camp near one of the sites where the Brooks party had been and pressed on from the north via the Muldrow glacier . Unlike some previous expeditions, they discovered a pass, since named McGonagall Pass, which allowed them to bypass the Wickersham Wall and access the higher reaches of the mountain. At roughly 11,000 feet (3,353 m), Tom Lloyd, old and less physically fit than

515-585: A base-to-peak height in the range of 12,000 to 15,300 ft (3,700 to 4,700 m). Denali's base-to-peak height is little more than half the 33,500 ft (10,200 m) of the volcano Mauna Kea , which lies mostly under water. Denali has two significant summits: the South Summit is the higher one, while the North Summit has an elevation of 19,470 ft (5,934 m) and a prominence of approximately 1,270 ft (387 m). The North Summit

618-428: A biotemperature below 1.5 °C (34.7 °F). Mountain environments are particularly sensitive to anthropogenic climate change and are currently undergoing alterations unprecedented in last 10,000 years. The effect of global warming on mountain regions (relative to lowlands) is still an active area of study. Observational studies show that highlands are warming faster than nearby lowlands, but when compared globally,

721-554: A meteorological station on a ridge near the summit of Denali at an elevation of 18,733 feet (5,710 m) in 1990. In 1998, this weather station was donated to the International Arctic Research Center at the University of Alaska Fairbanks . In June 2002, a weather station was placed at the 19,000-foot (5,800 m) level. This weather station was designed to transmit data in real-time for use by

824-464: A mountain is roughly equivalent to moving 80 kilometres (45 miles or 0.75° of latitude ) towards the nearest pole. This relationship is only approximate, however, since local factors such as proximity to oceans (such as the Arctic Ocean) can drastically modify the climate. As the altitude increases, the main form of precipitation becomes snow and the winds increase. The effect of

927-475: A mountain, for the purposes of access, is a summit of 2,000 feet (610 m) or higher. In addition, some definitions also include a topographical prominence requirement, such as that the mountain rises 300 metres (984 ft) above the surrounding terrain. At one time, the United States Board on Geographic Names defined a mountain as being 1,000 feet (305 m) or taller, but has abandoned

1030-482: A mountain. Elevation, volume, relief, steepness, spacing and continuity have been used as criteria for defining a mountain. In the Oxford English Dictionary a mountain is defined as "a natural elevation of the earth surface rising more or less abruptly from the surrounding level and attaining an altitude which, relatively to the adjacent elevation, is impressive or notable." Whether a landform

1133-403: A party directed by Hudson Stuck and Harry Karstens , along with Walter Harper and Robert Tatum . Karstens relocated to Alaska in the gold rush of 1897, and in subsequent years became involved in a variety of endeavors beyond mining, including helping establish dog mushing routes to deliver mail across vast swathes of territory and supporting expeditions led by naturalist Charles Sheldon near

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1236-727: A presidential visit to Alaska, the Barack Obama administration announced the name Denali would be restored in line with the Alaska Geographic Board's designation. U.S. Secretary of the Interior Sally Jewell issued the order changing the name to Denali on August 28, 2015, effective immediately. Jewell said the change had been "a long time coming". The renaming of the mountain received praise from Alaska's senior U.S. senator, Lisa Murkowski (R-AK), who had previously introduced legislation to accomplish

1339-596: A shoestring budget" without any other experienced climbers. The party navigated up the Cook inlet and followed the path of the 1902 Brooks party towards Denali. Cook approached the mountain via the Peters Glacier, as Wickersham had done; however, he was able to overcome the ice fall that had caused the previous group to turn up the spur towards the Wickersham Wall. Despite avoiding this obstacle, on August 31, having reached an elevation of about 10,900 feet (3,322 m) on

1442-648: A significant role in religion. There are for example a number of sacred mountains within Greece such as Mount Olympus which was held to be the home of the gods. In Japanese culture, the 3,776.24 m (12,389.2 ft) volcano of Mount Fuji is also held to be sacred with tens of thousands of Japanese ascending it each year. Mount Kailash , in the Tibet Autonomous Region of China, is considered to be sacred in four religions: Hinduism, Bon , Buddhism, and Jainism . In Ireland, pilgrimages are made up

1545-533: A sloping plain with elevations from 1,000 to 3,000 ft (300 to 910 m), for a base-to-peak height of 17,000 to 19,000 ft (5,000 to 6,000 m). By comparison, Mount Everest rises from the Tibetan Plateau at a much higher base elevation. Base elevations for Everest range from 13,800 ft (4,200 m) on the south side to 17,100 ft (5,200 m) on the Tibetan Plateau, for

1648-527: A temperature of −74.4 °F (−59.1 °C) combined with a wind speed of 18.4 miles per hour (29.6 km/h) to produce a North American record windchill of −118.1 °F (−83.4 °C). Even in July, this weather station has recorded temperatures as low as −22.9 °F (−30.5 °C) and windchills as low as −59.2 °F (−50.7 °C). According to the National Park Service , in 1932

1751-471: A whole, 24% of the Earth's land mass is mountainous. There are three main types of mountains: volcanic , fold , and block . All three types are formed from plate tectonics : when portions of the Earth's crust move, crumple, and dive. Compressional forces, isostatic uplift and intrusion of igneous matter forces surface rock upward, creating a landform higher than the surrounding features. The height of

1854-489: A year later. The mountain is climbed regularly nowadays. In 2003, around 58% of climbers reached the top. But by that time, the mountain had claimed the lives of nearly 100 mountaineers. The vast majority of climbers use the West Buttress Route, pioneered in 1951 by Bradford Washburn , after an extensive aerial photographic analysis of the mountain. Climbers typically take two to four weeks to ascend Denali. It

1957-452: Is El Alto , Bolivia, at 4,150 metres (13,620 ft), which has a highly diverse service and manufacturing economy and a population of nearly 1 million. Traditional mountain societies rely on agriculture, with higher risk of crop failure than at lower elevations. Minerals often occur in mountains, with mining being an important component of the economics of some mountain-based societies. More recently, tourism has become more important to

2060-525: Is 8,850 m (29,035 ft) above mean sea level. The highest known mountain on any planet in the Solar System is Olympus Mons on Mars at 21,171 m (69,459 ft). The tallest mountain including submarine terrain is Mauna Kea in Hawaii from its underwater base at 9,330 m (30,610 ft) and some scientists consider it to be the tallest on earth. There is no universally accepted definition of

2163-478: Is a poor conductor of heat, so a parcel of air will rise and fall without exchanging heat. This is known as an adiabatic process , which has a characteristic pressure-temperature dependence. As the pressure gets lower, the temperature decreases. The rate of decrease of temperature with elevation is known as the adiabatic lapse rate , which is approximately 9.8 °C per kilometre (or 5.4 °F (3.0 °C) per 1000 feet) of altitude. The presence of water in

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2266-419: Is a set of outdoor activities that involves ascending mountains . Mountaineering-related activities include traditional outdoor climbing , skiing , and traversing via ferratas that have become sports in their own right. Indoor climbing , sport climbing , and bouldering are also considered variants of mountaineering by some, but are part of a wide group of mountain sports . Mountains often play

2369-535: Is based on a Koyukon word for 'high' or 'tall'. During the Russian ownership of Alaska , the common name for the mountain was Bolshaya Gora ( Russian : Большая Гора ; bolshaya 'big'; gora 'mountain'), which is the Russian translation of Denali . It was briefly called Densmore's Mountain in the late 1880s and early 1890s after Frank Densmore, a gold prospector who was the first non-native Alaskan to reach

2472-553: Is called a mountain may depend on local usage. John Whittow's Dictionary of Physical Geography states "Some authorities regard eminences above 600 metres (1,969 ft) as mountains, those below being referred to as hills." In the United Kingdom and the Republic of Ireland, a mountain is usually defined as any summit at least 2,000 feet (610 m) high, which accords with the official UK government's definition that

2575-527: Is known as a "space problem." As the right-lateral movement along the Denali Fault continues, high compressional forces created at the fault bend essentially push the crust up in a vertical fashion. The longer the crust stays within the restraining bend, the higher the topography will be. Several active normal faults north of the restraining bend have recently been mapped with slip rates of approximately 2–6 mm/year. These normal faults help to accommodate

2678-556: Is not enough oxygen to support human life. This is sometimes referred to as the " death zone ". The summits of Mount Everest and K2 are in the death zone. Mountains are generally less preferable for human habitation than lowlands, because of harsh weather and little level ground suitable for agriculture . While 7% of the land area of Earth is above 2,500 metres (8,200 ft), only 140 million people live above that altitude and only 20-30 million people above 3,000 metres (9,800 ft) elevation. About half of mountain dwellers live in

2781-475: Is not to be confused with the distance from the center of the Earth. Due to the equatorial bulge , the summits of Mount Everest and Chimborazo have, respectively, the largest elevation and the largest geocentric distance. In aviation, the term elevation or aerodrome elevation is defined by the ICAO as the highest point of the landing area. It is often measured in feet and can be found in approach charts of

2884-665: Is one of the Seven Summits ; summiting all of them is a challenge for mountaineers. On August 4, 2018, five people died in the K2 Aviation de Havilland Beaver (DHC-2) crash near Denali. From 1947 to 2018 in the United States "2,799 people were reported to be involved in mountaineering accidents" and 11% of these accidents occurred on Denali. Of these 2,799 accidents, 43% resulted in death and 8% of these deaths occurred on Denali. The Japanese Alpine Club installed

2987-494: Is related to the complex structural relationships created by the right-lateral Denali Fault and Denali Fault Bend. The Denali Fault is caused by stresses created by the low-angle subduction of the Yakutat microplate underneath Alaska. The Denali Fault Bend is characterized as a gentle restraining bend. The Denali Fault Bend represents a curvature in the Denali Fault that is approximately 75 km long. This curvature creates what

3090-537: Is sometimes counted as a separate peak (see e.g., fourteener ) and sometimes not; it is rarely climbed, except by those doing routes on the north side of the massif . Five large glaciers flow off the slopes of the mountain. The Peters Glacier lies on the northwest side of the massif, while the Muldrow Glacier falls from its northeast slopes. Just to the east of the Muldrow, and abutting the eastern side of

3193-457: Is the highest mountain on Earth, at 8,848 metres (29,029 ft). There are at least 100 mountains with heights of over 7,200 metres (23,622 ft) above sea level, all of which are located in central and southern Asia. The highest mountains above sea level are generally not the highest above the surrounding terrain. There is no precise definition of surrounding base, but Denali , Mount Kilimanjaro and Nanga Parbat are possible candidates for

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3296-525: Is the largest mountain on Earth in terms of base area (about 2,000 sq mi or 5,200 km ) and volume (about 18,000 cu mi or 75,000 km ). Mount Kilimanjaro is the largest non-shield volcano in terms of both base area (245 sq mi or 635 km ) and volume (1,150 cu mi or 4,793 km ). Mount Logan is the largest non-volcanic mountain in base area (120 sq mi or 311 km ). The highest mountains above sea level are also not those with peaks farthest from

3399-448: Is the main type of map used to depict elevation, often through contour lines . In a Geographic Information System (GIS), digital elevation models (DEM) are commonly used to represent the surface (topography) of a place, through a raster (grid) dataset of elevations. Digital terrain models are another way to represent terrain in GIS. USGS (United States Geologic Survey) is developing

3502-612: The New York Sun that appeared on January 24, 1897. His report drew attention with the sentence "We have no doubt that this peak is the highest in North America, and estimate that it is over 20,000 feet (6,100 m) high." Until then, Mount Logan in Canada's Yukon Territory was believed to be the continent's highest point. Though later praised for his estimate, Dickey admitted that other prospector parties had also guessed

3605-632: The "fake peak" photograph of Barrill standing on the promontory. It showed a wider view of surrounding features, appearing to definitively discount Cook's claim. Given the skepticism concerning Cook's story, interest in claiming the first ascent remained. Miners and other Alaskans living in Kantishna and Fairbanks wanted the honors to go to local men. In 1909, four Alaska residents – Tom Lloyd, Peter Anderson, Billy Taylor, and Charles McGonagall – set out from Fairbanks , Alaska during late December with supplies and dogs that were in part paid for by bettors in

3708-573: The Alaskan Athabascan names for Denali. The Koyukon Athabaskans , living in the Yukon , Tanana and Kuskokwim basins, were the first Native Americans with access to the flanks of the mountain. A British naval captain and explorer, George Vancouver , is the first European on record to have sighted Denali, when he noted "distant stupendous mountains" while surveying the Knik Arm of

3811-526: The Andes , Central Asia, and Africa. With limited access to infrastructure, only a handful of human communities exist above 4,000 metres (13,000 ft) of elevation. Many are small and have heavily specialized economies, often relying on industries such as agriculture, mining, and tourism. An example of such a specialized town is La Rinconada, Peru , a gold-mining town and the highest elevation human habitation at 5,100 metres (16,700 ft). A counterexample

3914-649: The Basin and Range Province of Western North America. These areas often occur when the regional stress is extensional and the crust is thinned. During and following uplift, mountains are subjected to the agents of erosion (water, wind, ice, and gravity) which gradually wear the uplifted area down. Erosion causes the surface of mountains to be younger than the rocks that form the mountains themselves. Glacial processes produce characteristic landforms, such as pyramidal peaks , knife-edge arêtes , and bowl-shaped cirques that can contain lakes. Plateau mountains, such as

4017-468: The Catskills , are formed from the erosion of an uplifted plateau. Climate in the mountains becomes colder at high elevations , due to an interaction between radiation and convection. Sunlight in the visible spectrum hits the ground and heats it. The ground then heats the air at the surface. If radiation were the only way to transfer heat from the ground to space, the greenhouse effect of gases in

4120-582: The Cook Inlet on May 6, 1794. The Russian explorer Lavrenty Zagoskin explored the Tanana and Kuskokwim rivers in 1843 and 1844, and was likely the first European to sight the mountain from the other side. William Dickey, a New Hampshire -born resident of Seattle , Washington who had been digging for gold in the sands of the Susitna River , wrote, after his returning from Alaska, an account in

4223-461: The Kantishna river by steamer , before offloading and following Chitsia Creek with a poling boat, mules and backpacks, a route suggested to them by Tanana Athabaskan people they met along the way. The party received further navigational assistance at Anotoktilon, an Athabaskan hunting camp, where residents gave the group detailed directions to reach the glaciers at the foot of Denali. On reaching

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4326-637: The United States Department of the Interior announced the change of the official name of the mountain to Denali. In 1903, James Wickersham recorded the first attempt at climbing Denali, which was unsuccessful. In 1906, Frederick Cook claimed the first ascent , but this ascent is unverified and its legitimacy questioned. The first verifiable ascent to Denali's summit was achieved on June 7, 1913, by climbers Hudson Stuck , Harry Karstens , Walter Harper , and Robert Tatum , who went by

4429-484: The United States Weather Bureau and found to be accurate. The lowest temperature that it had recorded was found to be approximately −100 °F (−73 °C). Another thermometer was placed at the 15,000-foot (4,600 m) level by the U.S. Army Natick Laboratory , and was there from 1950 to 1969. The lowest temperature recorded during that period was also −100 °F (−73 °C). Besides

4532-466: The ecosystems of mountains: different elevations have different plants and animals. Because of the less hospitable terrain and climate, mountains tend to be used less for agriculture and more for resource extraction, such as mining and logging , along with recreation, such as mountain climbing and skiing . The highest mountain on Earth is Mount Everest in the Himalayas of Asia , whose summit

4635-685: The subduction of the Pacific Plate beneath the North American Plate ; at the same time, the sedimentary material above and around the mountain was stripped away by erosion . The forces that lifted Denali also caused many deep earthquakes in Alaska and the Aleutian Islands . The Pacific Plate is seismically active beneath Denali, a tectonic region that is known as the "McKinley cluster". The high topography of Denali

4738-621: The 952 metres (3,123 ft) Mount Brandon by Irish Catholics . The Himalayan peak of Nanda Devi is associated with the Hindu goddesses Nanda and Sunanda; it has been off-limits to climbers since 1983. Mount Ararat is a sacred mountain, as it is believed to be the landing place of Noah's Ark . In Europe and especially in the Alps , summit crosses are often erected on the tops of prominent mountains. Heights of mountains are typically measured above sea level . Using this metric, Mount Everest

4841-576: The Brooklyn Bridge to Grant's Tomb [a distance of eight miles] in ten minutes." In May 1907, Harper's Magazine published Cook's account of the climb along with a photograph of what appeared to be Barrill standing on the summit. By 1909, Barrill had recanted at least part of his story about the climb, and others publicly questioned the account; however, Cook continued to assert his claim The controversy continued for decades. In 1956, mountaineers Bradford Washburn and Walter Gonnason tried to settle

4944-528: The Grand Basin between the north and south peaks. On June 7, the team made the summit attempt. Temperatures were below −20 °F (−29 °C) at times. Every man, and particularly Stuck, suffered from altitude sickness. By midday, Harper became the first climber to reach the summit, followed seconds later by Tatum and Karstens. Stuck arrived last, falling unconscious on the summit. Using the mountain's contemporary name, Tatum later commented, "The view from

5047-525: The Liek-Lindley expedition recovered a self-recording minimum thermometer left near Browne's Tower, at about 15,000 feet (4,600 m), on Denali by the Stuck-Karstens party in 1913. The spirit thermometer was calibrated down to −95 °F (−71 °C), and the lowest recorded temperature was below that point. Harry J. Liek took the thermometer back to Washington, D.C. where it was tested by

5150-466: The North Summit mentioned above, other features on the massif which are sometimes included as separate peaks are: Nearby peaks include: Mountain A mountain is an elevated portion of the Earth's crust , generally with steep sides that show significant exposed bedrock . Although definitions vary, a mountain may differ from a plateau in having a limited summit area, and is usually higher than

5253-480: The Parker-Browne expedition as a gentle slope ascended in no more than three days as a dangerous, ice-strewn morass on a knife-edged ridge (later named Karstens ridge). It would take the team three weeks to cover the same ground, as Karstens and Harper laboriously cut steps into the ice. On May 30, the team, with the help of some good weather, ascended to a new high camp, situated at 17,500 feet (5,334 m) in

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5356-488: The Parker-Browne party were only about 200 feet (61 m) of elevation short of the true summit when they turned back. Stuck and Karstens' team achieved the uncontroversial first ascent of Denali's south peak; however, the news was met with muted interest by the wider climbing community. Appalachia Journal , then the official journal of the American Alpine Club , published a small notice of the accomplishment

5459-620: The Secretary of the Interior has authority under federal law to change geographic names when the Board of Geographic Names does not act on a naming request within a "reasonable" period of time. Jewell told the Alaska Dispatch News that "I think any of us would think that 40 years is an unreasonable amount of time." Indigenous names for Denali can be found in seven different Alaskan languages. The names fall into two categories. To

5562-547: The South Summit. In 1951, Bradford Washburn pioneered the West Buttress route, considered to be the safest and easiest route, and therefore the most popular currently in use. On September 2, 2015, the U.S. Geological Survey measured the mountain at 20,310 feet (6,190 m) high, 10 ft lower than the 20,320 feet (6,194 m) measured in 1952 using photogrammetry . Denali is a granitic pluton , mostly pink quartz monzonite , lifted by tectonic pressure from

5665-455: The US. Fold mountains occur when two plates collide: shortening occurs along thrust faults and the crust is overthickened. Since the less dense continental crust "floats" on the denser mantle rocks beneath, the weight of any crustal material forced upward to form hills, plateaus or mountains must be balanced by the buoyancy force of a much greater volume forced downward into the mantle. Thus

5768-461: The aerodrome. It is not to be confused with terms such as the altitude or height. GIS or geographic information system is a computer system that allows for visualizing, manipulating, capturing, and storage of data with associated attributes. GIS offers better understanding of patterns and relationships of the landscape at different scales. Tools inside the GIS allow for manipulation of data for spatial analysis or cartography. A topographical map

5871-404: The area around the mountain have referred to the peak as "Denali" for centuries. In 1896, a gold prospector named it "Mount McKinley" in support of then-presidential candidate William McKinley , who later became the 25th president; McKinley's name was the official name recognized by the federal government of the United States from 1917 until 2015. In August 2015, 40 years after Alaska had done so,

5974-553: The atmosphere complicates the process of convection. Water vapor contains latent heat of vaporization . As air rises and cools, it eventually becomes saturated and cannot hold its quantity of water vapor. The water vapor condenses to form clouds and releases heat, which changes the lapse rate from the dry adiabatic lapse rate to the moist adiabatic lapse rate (5.5 °C per kilometre or 3 °F (1.7 °C) per 1000 feet) The actual lapse rate can vary by altitude and by location. Therefore, moving up 100 m (330 ft) on

6077-429: The atmosphere would keep the ground at roughly 333 K (60 °C; 140 °F), and the temperature would decay exponentially with height. However, when air is hot, it tends to expand, which lowers its density. Thus, hot air tends to rise and transfer heat upward. This is the process of convection . Convection comes to equilibrium when a parcel of air at a given altitude has the same density as its surroundings. Air

6180-509: The base of Denali. Stuck was an English-born Episcopal priest who came to Alaska by chance. He became acclimated to the often harsh Alaskan environment because of his many travels between far-flung outposts within his district, climbing mountains as a hobby. At 21 years old, Harper was already known as a skilled and strong outdoorsman, the Alaska-born son of a Koyukon-Athabascan mother and Irish gold prospector father. Tatum, also 21 years old,

6283-496: The base of the mountain. In 1896, a gold prospector named it McKinley as political support for then-presidential candidate William McKinley , who became president the following year. The United States formally recognized the name Mount McKinley after President Wilson signed the Mount McKinley National Park Act of February 26, 1917. In 1965, Lyndon B. Johnson declared the north and south peaks of

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6386-518: The centre of the Earth, because the figure of the Earth is not spherical. Sea level closer to the equator is several miles farther from the centre of the Earth. The summit of Chimborazo , Ecuador's tallest mountain, is usually considered to be the farthest point from the Earth's centre, although the southern summit of Peru's tallest mountain, Huascarán , is another contender. Both have elevations above sea level more than 2 kilometres (6,600 ft) less than that of Everest. Elevation Elevation

6489-459: The climate on the ecology at an elevation can be largely captured through a combination of amount of precipitation, and the biotemperature , as described by Leslie Holdridge in 1947. Biotemperature is the mean temperature; all temperatures below 0 °C (32 °F) are considered to be 0 °C. When the temperature is below 0 °C, plants are dormant, so the exact temperature is unimportant. The peaks of mountains with permanent snow can have

6592-420: The climbing public and the science community. Since its establishment, annual upgrades to the equipment have been performed with instrumentation custom built for the extreme weather and altitude conditions. This weather station is the third-highest weather station in the world. The weather station recorded a temperature of −75.5 °F (−59.7 °C) on December 1, 2003. On the previous day of November 30, 2003,

6695-619: The coast and began to disperse. In September 1906, Cook and a single party-member, horseman Robert Barrill, journeyed towards the summit again, in what Cook later described as "a last desperate attempt" in a telegram to his financial backers. Cook and Barrill spent 12 days in total on the attempt, and claimed to have reached the summit via the Ruth Glacier . Upon hearing Cook's claims, Parker and Browne were immediately suspicious. Browne later wrote that he knew Cook's claims were lies, just as "any New Yorker would know that no man could walk from

6798-534: The conditions above and below a particular zone will be inhospitable and thus constrain their movements or dispersal . These isolated ecological systems are known as sky islands . Altitudinal zones tend to follow a typical pattern. At the highest elevations, trees cannot grow, and whatever life may be present will be of the alpine type, resembling tundra . Just below the tree line , one may find subalpine forests of needleleaf trees, which can withstand cold, dry conditions. Below that, montane forests grow. In

6901-476: The continental crust is normally much thicker under mountains, compared to lower lying areas. Rock can fold either symmetrically or asymmetrically. The upfolds are anticlines and the downfolds are synclines : in asymmetric folding there may also be recumbent and overturned folds. The Balkan Mountains and the Jura Mountains are examples of fold mountains. Block mountains are caused by faults in

7004-513: The crust: a plane where rocks have moved past each other. When rocks on one side of a fault rise relative to the other, it can form a mountain. The uplifted blocks are block mountains or horsts . The intervening dropped blocks are termed graben : these can be small or form extensive rift valley systems. This kind of landscape can be seen in East Africa , the Vosges and Rhine valley, and

7107-548: The definition since the 1970s. Any similar landform lower than this height was considered a hill. However, today, the United States Geological Survey concludes that these terms do not have technical definitions in the US. The UN Environmental Programme 's definition of "mountainous environment" includes any of the following: Using these definitions, mountains cover 33% of Eurasia, 19% of South America, 24% of North America, and 14% of Africa. As

7210-453: The descent, an accessible pass northeast of the Muldrow Glacier following the headwaters of the Toklat and Chulitna rivers. In 1906, Cook initiated another expedition to Denali with co-leader Herschel Parker , a Columbia University professor of electrical engineering with extensive mountaineering experience. Belmore Browne, an experienced climber and five other men comprised the rest of

7313-460: The dry season and in semiarid areas such as in central Asia. Alpine ecosystems can be particularly climatically sensitive. Many mid-latitude mountains act as cold climate refugia, with the ecosystems occupying small environmental niches. As well as the direct influence that the change in climate can have on an ecosystem, there is also the indirect one on the soils from changes in stability and soil development. The colder climate on mountains affects

7416-523: The economies of mountain communities, with developments focused around attractions such as national parks and ski resorts . Approximately 80% of mountain people live below the poverty line. Most of the world's rivers are fed from mountain sources, with snow acting as a storage mechanism for downstream users. More than half of humanity depends on mountains for water. In geopolitics , mountains are often seen as natural boundaries between polities. Mountaineering , mountain climbing, or alpinism

7519-428: The effect disappears. Precipitation in highland areas is not increasing as quickly as in lowland areas. Climate modeling give mixed signals about whether a particular highland area will have increased or decreased precipitation. Climate change has started to affect the physical and ecological systems of mountains. In recent decades mountain ice caps and glaciers have experienced accelerating ice loss. The melting of

7622-433: The feature makes it either a hill or, if higher and steeper, a mountain. Major mountains tend to occur in long linear arcs, indicating tectonic plate boundaries and activity. Volcanoes are formed when a plate is pushed below another plate , or at a mid-ocean ridge or hotspot . At a depth of around 100 km (60 mi), melting occurs in rock above the slab (due to the addition of water), and forms magma that reaches

7725-410: The final few hundred feet to reach the north peak of Denali, at 19,470 feet (5,934 m) high, the shorter of the two peaks. The pair erected the pole near the top, with the hope that it would be visible from lower reaches to prove they had made it. After the expedition, Tom Lloyd returned to Fairbanks, while the three others remained in Kantishna to mine. In Lloyd's recounting, all four men made it to

7828-498: The glaciers, permafrost and snow has caused underlying surfaces to become increasingly unstable. Landslip hazards have increased in both number and magnitude due to climate change. Patterns of river discharge will also be significantly affected by climate change, which in turn will have significant impacts on communities that rely on water fed from alpine sources. Nearly half of mountain areas provide essential or supportive water resources for mainly urban populations, in particular during

7931-468: The group. Cook and Parker's group spent most of the summer season exploring the southern and southeastern approaches to the mountain, eventually reaching a high point on Tokositna glacier , 25 miles (40 km) from the summit. During their explorations the party mapped out many of the tributaries and glaciers of the Susitna river along the mountain's south flank. As the summer ended, the team retreated to

8034-533: The importance of the mountain and its name, Will Mayo, former president of the Tanana Chiefs Conference , an organization that represents 42 Athabaskan tribes in the Alaskan interior, said "It's not one homogeneous belief structure around the mountain, but we all agree that we're all deeply gratified by the acknowledgment of the importance of Denali to Alaska's people." The following table lists

8137-630: The massif, is the Traleika Glacier . The Ruth Glacier lies to the southeast of the mountain, and the Kahiltna Glacier leads up to the southwest side of the mountain. With a length of 44 mi (71 km), the Kahiltna Glacier is the longest glacier in the Alaska Range . The Koyukon Athabaskans who inhabit the area around the mountain have for centuries referred to the peak as Dinale or Denali . The name

8240-545: The matter, with Gonnason attempting to follow Cook's purported route to the summit. Washburn noted inconsistencies between Cook's account of locations of glaciers and found a spot, at 5,400 feet (1,646 m) and 19 miles (31 km) southeast of the summit that appeared identical to the supposed summit image. Gonnason was not able to complete the climb, but because he was turned back by poor weather, felt that this did not definitely disprove Cook's story. In 1998, historian Robert Bryce discovered an original and un-cropped version of

8343-501: The mountain the "Churchill Peaks", in honor of British statesman Winston Churchill . The Alaska Board of Geographic Names changed the name of the mountain to Denali in 1975, which was how it is called locally. However, a request in 1975 from the Alaska state legislature to the United States Board on Geographic Names to do the same at the federal level was blocked by Ohio congressman Ralph Regula , whose district included McKinley's home town of Canton . On August 30, 2015, just ahead of

8446-600: The mountain to be over 20,000 feet (6,100 m). These estimates were confirmed in 1898 by the surveyor Robert Muldrow , who measured its elevation as 20,300 feet (6,200 m). On November 5, 2012, the United States Mint released a twenty-five cent piece depicting Denali National Park. It is the fifteenth of the America the Beautiful Quarters series. The reverse features a Dall sheep with

8549-458: The mountain, the mountaineers set up base camp on the lower portion of Peters Glacier . Aiming for the northwest buttress of Denali's north peak, they attempted to ascend directly; however, crevasses , ice fall and the lack of a clear passage caused them to turn and attempt to follow a spur via Jeffery Glacier where they believed they could see a way to the summit. After a dangerous ascent, at around 10,000 feet (3,048 m), Wickersham found that

8652-420: The name change, but it drew criticism from several politicians from President McKinley's home state of Ohio, such as Governor John Kasich , U.S. Senator Rob Portman , U.S. House Speaker John Boehner , and Representative Bob Gibbs , who described Obama's action as "constitutional overreach" because he said an act of Congress was required to rename the mountain. The Alaska Dispatch News reported that

8755-429: The northwest buttress of the north peak, the party found they had reached a dead end and could make no further progress. On the descent, the group completely circumnavigated the mountain, the first climbing party to do so. Although Cook's 1903 expedition did not reach the summit, he received acclaim for the accomplishment, a 1,000 miles (1,609 km) trek in which he not only circled the entire mountain but also found, on

8858-532: The others, stayed behind. According to their account, the remaining three men pioneered a route following Karstens Ridge around the Harper Icefall, then reached the upper basin before ascending to Pioneer Ridge. The three men carried a 14-foot-long (4.3 m) spruce pole. Around 19,000 feet (5,791 m), Charles McGonagall, older and having exhausted himself carrying the spruce pole, remained behind. On April 3, 1910, Billy Taylor and Peter Anderson scrambled

8961-714: The party decided to delay one day so "that we might actually set foot on the slopes of the mountain". Setting off alone, with good weather, on August 4, Brooks aimed to reach a 10,000 feet (3,048 m) shoulder. At 7,500 feet (2,286 m), Brooks found his way blocked by sheer ice and, after leaving a small cairn as a marker, descended. After the party's return, Brooks co-authored a "Plan For Climbing Mt McKinley", published in National Geographic magazine in January 1903, with fellow party-member and topographer D. L. Raeburn, in which they suggested that future attempts at

9064-510: The peak of Denali in the background. During the summer of 1902 scientist Alfred Brooks explored the flanks of the mountain as a part of an exploratory surveying party conducted by the U.S. Geological Survey . The party landed at Cook Inlet in late May, then traveled east, paralleling the Alaska Range , before reaching the slopes of Denali in early August. Camped on the flank of the mountain on August 3, Brooks noted later that while "the ascent of Mount McKinley had never been part of our plans",

9167-527: The plants and animals residing on mountains. A particular set of plants and animals tend to be adapted to a relatively narrow range of climate. Thus, ecosystems tend to lie along elevation bands of roughly constant climate. This is called altitudinal zonation . In regions with dry climates, the tendency of mountains to have higher precipitation as well as lower temperatures also provides for varying conditions, which enhances zonation. Some plants and animals found in altitudinal zones tend to become isolated since

9270-435: The route did not connect as it had appeared from below, instead discovering "a tremendous precipice beyond which we cannot go. Our only line of further ascent would be to climb the vertical wall of the mountain at our left, and that is impossible." This wall, now known as the Wickersham Wall, juts 15,000 feet (4,572 m) upwards from the glacier to the north peak of Denali. Because of the route's history of avalanche danger, it

9373-555: The single later climbing group, who were friendly with some of the Sourdough expedition men, no other group would ever see it. Jon Waterman, author of the book Chasing Denali , which explored the controversy, outlined several reasons to doubt the claim: There was never any photographic evidence. The four men climbed during the winter season, known for much more difficult conditions, along a route that has never been fully replicated. They were inexperienced climbers, ascending without any of

9476-615: The south of the Alaska Range in the Dena'ina and Ahtna languages the mountain is known by names that are translated as "big mountain". To the north of the Alaska Range in the Lower Tanana , Koyukon , Upper Kuskokwim , Holikachuk , and Deg Xinag languages the mountain is known by names that are translated as "the high one", "the tall one" (Koyukon, Lower and Middle Tanana, Upper Kuskokwim, Deg Xinag, and Holikachuk). Asked about

9579-411: The summit should approach from the north, not the south. The report received substantial attention, and within a year, two climbing parties declared their intent to summit. During the early summer of 1903, Judge James Wickersham , then of Eagle, Alaska , made the first recorded attempt to climb Denali, along with a party of four others. The group attempted to get as close to the mountain as possible via

9682-514: The surface. When the magma reaches the surface, it often builds a volcanic mountain, such as a shield volcano or a stratovolcano . Examples of volcanoes include Mount Fuji in Japan and Mount Pinatubo in the Philippines. The magma does not have to reach the surface in order to create a mountain: magma that solidifies below ground can still form dome mountains , such as Navajo Mountain in

9785-477: The tallest mountain on land by this measure. The bases of mountain islands are below sea level, and given this consideration Mauna Kea (4,207 m (13,802 ft) above sea level) is the world's tallest mountain and volcano, rising about 10,203 m (33,474 ft) from the Pacific Ocean floor. The highest mountains are not generally the most voluminous. Mauna Loa (4,169 m or 13,678 ft)

9888-473: The temperate portions of the earth, those forests tend to be needleleaf trees, while in the tropics, they can be broadleaf trees growing in a rainforest . The highest known permanently tolerable altitude is at 5,950 metres (19,520 ft). At very high altitudes, the decreasing atmospheric pressure means that less oxygen is available for breathing, and there is less protection against solar radiation ( UV ). Above 8,000 metres (26,000 ft) elevation, there

9991-469: The top of Mount McKinley is like looking out the windows of Heaven!" During the climb, Stuck spotted, via binoculars, the presence of a large pole near the North Summit; this report confirmed the Sourdough ascent, and it is widely believed presently that the Sourdoughs did succeed on the North Summit. However, the pole was never seen before or since, so there is still some doubt. Stuck also discovered that

10094-399: The top of not only the north peak, but the higher south peak as well. When the remaining three men returned to town with conflicting accounts, the entire expedition's legitimacy was questioned. Several years later, another climbing group would claim to have seen the spruce pole in the distance, supporting their north peak claim. However, some continue to doubt they reached the summit. Outside of

10197-414: The unusual curvature of the restraining bend. Denali has a summit elevation of 20,310 feet (6,190 m) above sea level , making it the highest peak in North America and the northernmost mountain above 19,685 feet (6,000 m) elevation in the world. Measured from base to peak at some 18,000 ft (5,500 m), it is among the largest mountains situated entirely above sea level. Denali rises from

10300-414: The usual safety gear or any care for altitude sickness. They claimed to have ascended from 11,000 feet (3,353 m) to the top in less than 18 hours, unheard of at a time when siege-style alpinism was the norm. Yet Waterman says "these guys were men of the trail. They didn't care what anybody thought. They were just tough SOBs." He noted that the men were largely unlettered and that some of the ensuing doubt

10403-490: Was a theology student working at a Tanana mission, and the least experienced of the team. His primary responsibility on the trip was as a cook. The team approached the peak from the north via the Muldrow glacier and McGonagall pass. While ferrying loads up to a camp at around 10,800 feet (3,292 m), they suffered a setback when a stray match accidentally set fire to some supplies, including several tents. The prior year's earthquake had left what had previously been described by

10506-399: Was not successfully climbed until 1963. Later in the summer of 1903, Dr. Frederick Cook directed a team of five men on another attempt at the summit. Cook was already an experienced explorer and had been a party-member on successful arctic expeditions commanded both by Robert Peary and Roald Amundsen . Yet he struggled to obtain funding for his own expedition, eventually organizing it "on

10609-496: Was related to their lack of sophistication in dealing with the press and the contemporary climbing establishment. In 1912, the Parker -Browne expedition nearly reached the summit, turning back within just a few hundred yards/meters of it due to harsh weather. On July 7, the day after their descent, a 7.4-magnitude earthquake shattered the glacier they had ascended. The first ascent of the main summit of Denali came on June 7, 1913, by

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