NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Icebergs off Greenland. Satellite image centred over the west coast of Greenland, showing an ice sheet (white, upper right) on the mainland, and a huge number of icebergs (small white specks) that have broken from it and are floating in the ocean. The ice sheet that covers almost all of Greenland (about 1.7 million square kilometres) holds so much ice that if it were to melt away entirely, global sea levels would rise 7 meters. The Greenland Ice Sheet feeds dozens of tidewater glaciers along the island's coast; as the ice sheet meets the ocean, chunks of ice periodically break off to form icebergs. Imaged by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA's Terra satellite, on 17th July 2005.
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