BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Glaciers. Aerial view of the vast Malaspina glacier plain in Alaska, USA. Earth. The dark material covering much of the glaciers' surfaces is rubble picked up by the glaciers during their journeys. It is generally comprised of soil and rock. When the glaciers melt, such material is deposited to form moraines.
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