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Antarctica is for the most part a vast, icy emptiness, some 14 million square kilometers of which is almost completely covered by an ice sheet with an average thickness of over 2, 000 meters.
Only about 2% of the land mass is ice-free, and about half of this is in the Ross Dependency comprised of land, ice, shelf and islands between 160 degrees east and 15 degrees west.
The largest single ice-free area lies in South Victoria Land, about 100 kilometers from New Zealand’s scientific research station, Scott Base on Ross Island.
The United States also has a large base at South Pole, known as the Amundsen-Scott Base and named after two of the most important early 20th century explorers who helped bring world attention to the continent.
Only a very small proportion of the Coast is easily accessible, mostly along the coast of Victoria Land and Ross Island.
The Frozen Continent: Facts & Figures
Ice sheet covered area of the Antarctica Some 14 mil. Square km
An ice sheet with (1) Over 2000 meters
The ice-free area of the Antarctica (2) of the land mass.
Position of the largest single ice-free area (3)
Two of the most important early 20th century ex-
plorers
(4)
The place easily accessible (5) of Victoria Land and Ross
Island

【参考答案】

an average thickness
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