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International Polar Day - Ice Sheets

December 13th, 2007 marks the second of the quarterly International Polar Days, this time focusing on Ice Sheets.
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About Ice Sheets
Although the Earth has many locations with permanent ice and glaciers, there are only two ice masses that are large enough to be classified as ice sheets: the Greenland Ice Sheet and the Antarctic Ice Sheet. These ice sheets are composed of snow that has fallen, become buried due to additional snowfall over time, and eventually been compressed into very thick ice. The ice sheets are over 1 kilometer thick on average and are the largest reservoir of fresh water on the Earth. They have important effects on the Earth