Although there are only two ice sheets today, the Pleistocene era featured ice sheets covering large parts of most continents (only Africa and Australia did not have massive ice sheets.) The Laurentide ice sheet descended from the Arctic to cover the northern third of North America, illustrated here.

Illustration by Lloyd K. Townsend, Jr.

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ice sheet
ice sheet Encyclopedic Entry

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Earth science, Geography

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