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How Much Of The Earth's Surface Is Covered With Ice?

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enotes | (Level 1) Valedictorian

Posted October 9, 2011 at 4:00 PM via web

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How Much Of The Earth's Surface Is Covered With Ice?

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fact-finder | (Level 3) Valedictorian

Posted October 10, 2011 at 4:00 PM (Answer #1)

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About 10.4 percent of the world's land surface, or approximately 6,020,000 square miles (15,600,000 square kilometers), is glaciated. Glaciated means permanently covered with ice. That ice takes the form of glaciers, ice sheets, or ice caps.

A glacier is a large mass of land ice that flows, under the force of gravity, at a rate of 10 to 1,000 feet (3 to 300 meters) per year. Glaciers on steep slopes may flow faster. For example, the Quarayoq Glacier in Greenland moves an average of 65 to 80 feet (20 to 24 meters) per day.

An ice sheet is a thick glacier that's larger than 19,000 square miles (50,000 square kilometers). An ice sheet blankets an area of land, completely covering its mountains and valleys, flowing outward in all directions. An ice cap is a sheet of ice and snow that continuously covers an area of land, but is smaller than an ice sheet.

The areas of glaciation in various parts of the world are:

Area
Place Square miles Square kilometers
Antarctica 5,250,000 12,588,000
North Polar Regions (Greenland, Northern Canada, Arctic Ocean islands) 799,000 2,070,000
Asia 44,000 115,800
Alaska & Rocky Mountains 29,700 76,900
South America 10,200 26,500
Iceland 4,699 12,170
Alpine Europe 3,580 9,280
New Zealand 391 1,015
Africa 5 12

Sources: The Guinness Book of Answers, 8th ed., pp. 92-93; Van der Leeden, Frits. The Water Encyclopedia, p. 203.

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