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Continental ice sheets were more common 28,000 years ago than they are today because the earth was cooler then than now.

An ice sheet is formed by the mass of glacial land ice. It extends more than 50,000 square kilometers. Earth has two continental ice sheets - one which covers the Greenland, the largest island in the world, and the other that covers across the Antarctic continent.

The Antarctic Ice Sheet covers almost 14 million square kilometers and the Greenland Ice Sheet covers about 1.7 million square kilometers. Together, the Antarctic and Greenland Ice Sheets contain more than 99 percent of the land ice on Earth.

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