The Greenland ice sheet covers 1,710,000 square kilometers (660,235 square miles), and is the traditional starting point for Arctic exploration. Here, igloos mark a cache of supplies on Robert Peary's expedition to the North Pole in 1909.

Photograph by Robert E. Peary

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ice sheet
ice sheet Encyclopedic Entry

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6 - 12 and up

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Geography, Science

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

Arctic
Arctic Encyclopedic Entry

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7 - 12 and up

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Geography, Science

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The Arctic is the northernmost region of the Earth