DAVID VAUGHAN / SCIENCE PHOTO LIBRARY DAVID VAUGHAN / SCIENCE PHOTO LIBRARY
Perutz Glacier on the Antarctica Peninsular. This glacier is 16 km long and 3.2 km wide. Glaciers form where annual snowfall exceeds annual melting and drainage. The snow compacts to ice under the weight of the layers above. The mass of ice moves slowly down a valley or depression and is constantly replenished from its source. If it reaches the sea it breaks up to form icebergs.
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