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Geography of Antarctica

Location: continent mostly south of the Antarctic Circle


(higher resolution copy (http://www.photolib.noaa.gov/corps/images/big/corp2359.jpg))

Geographic coordinates: 90 00 S, 0 00 E

Map references: Antarctic Region

Area:
total: 14 million sq km
land: 14 million sq km (280,000 sq km ice-free, 13.72 million sq km ice-covered) (est.)
note: fifth-largest continent, following Asia, Africa, North America, and South America, but larger than Australia and the subcontinent of Europe

Land boundaries: 0 km
note: see entry on Transnational issues of Antarctica[?]

Coastline: 17,968 km

Maritime claims: none, but see the Disputes - international entry

Climate: severe low temperatures vary with latitude, elevation, and distance from the ocean; East Antarctica is colder than West Antarctica because of its higher elevation; Antarctic Peninsula has the most moderate climate; higher temperatures occur in January along the coast and average slightly below freezing

Terrain: about 98% thick continental ice sheet and 2% barren rock, with average elevations between 2,000 and 4,000 meters; mountain ranges up to 5,140 meters; ice-free coastal areas include parts of southern Victoria Land[?], Wilkes Land[?], the Antarctic Peninsula[?] area, and parts of Ross Island on McMurdo Sound[?]; glaciers form ice shelves along about half of the coastline, and floating ice shelves constitute 11% of the area of the continent

Elevation extremes:
lowest point: Southern Ocean 0 m
highest point: Vinson Massif 5,140 m

Natural resources: none presently exploited; iron ore, chromium, copper, gold, nickel, platinum and other minerals, and coal and hydrocarbons have been found in small, uncommercial quantities

Land use:
arable land: 0%
permanent crops: 0%
permanent pastures: 0%
forests and woodland: 0%
other: 100% (ice 98%, barren rock 2%)

Irrigated land: 0 sq km (1993)

Natural hazards: katabatic (gravity-driven) winds blow coastward from the high interior; frequent blizzards form near the foot of the plateau; cyclonic storms form over the ocean and move clockwise along the coast; volcanism on Deception Island and isolated areas of West Antarctica; other seismic activity rare and weak

Environment - current issues: in 1998, NASA satellite data showed that the antarctic ozone hole was the largest on record, covering 27 million square kilometers; researchers in 1997 found that increased ultraviolet light coming through the hole damages the DNA of icefish, an antarctic fish lacking hemoglobin; ozone depletion earlier was shown to harm one-celled antarctic marine plants

Geography - note: the coldest, windiest, highest (on average), and driest continent; during summer, more solar radiation reaches the surface at the South Pole than is received at the Equator in an equivalent period; mostly uninhabitable

See also : Antarctica



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