Ice sheets are so large that they radically alter the landscape of the continents they cover. The weight of the ice sheet depresses the land beneath it. Without its ice sheet, the continent of Antarctica would shrink by more than a quarter, as most of its western half sinks into the sea. A cutaway view on this map illustrates this.

Map by National Geographic Maps

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ice sheet
ice sheet Encyclopedic Entry

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An ice sheet is a type of glacier that covers a very large area