A mass of glacial land ice extending more than 50,000 square kilometers (20,000 square miles). The two ice sheets on Earth today cover most of Greenland and Antarctica and together they contain more than 99 percent of the freshwater ice on Earth. The Greenland Ice SheetA mass of glacial land ice extending more than 50,000 square kilometers (20,000 square miles). The two ice sheets on Earth today cover most of Greenland and Antarctica and together... More in the Arcticextends about 1.7 million square kilometers (656,000 square miles). In the past, other ArcticDefinitions of the Arctic vary according to environmental, geographical, political, cultural and scientific perspectives. Some scientists define the Arctic as areas having a high latitude, long winters, short, cool summers,... More ice sheets have existed, such as the Barents Shelf and Innuitian sheets.

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