Why do valley glaciers erode and deposit material?
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Like flowing water, flowing ice erodes the land and deposits the material elsewhere. Glaciers cause erosion in two main ways: plucking and abrasion. ... They freeze to the bottom of the glacier and are carried away by the flowing ice. Abrasion is the process in which a glacier scrapes underlying rock
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While glaciers erode the landscape, they also deposit materials. Glaciers deposit their sediment when they melt. They drop and leave behind whatever was once frozen in their ice. A ground moraine is a thick layer of sediments left behind by a retreating glacier.
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