DR MORLEY READ / SCIENCE PHOTO LIBRARY DR MORLEY READ / SCIENCE PHOTO LIBRARY
Glacier on the side of a volcano. A glacier is a huge mass of ice formed from compacted snow that moves slowly over a land mass. Glaciers often carry rocks that have fallen from higher up. This material is called surface moraine. Photographed at 4800 metres altitude on the Cotopaxi volcano in the Andes Mountains of Ecuador.
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