SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
Glacier (upper left) seen from the summit of the Ehrenberg Fjeld (mountain) in North East Greenland National Park, Greenland. Glaciers are slow- moving bodies of ice formed from compacted snow. Their movement down mountains can carve out valleys with a characteristic U shape, such as the one seen at upper right.
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