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OpenStudy (anonymous):

In glacial erosion by abrasion, a glacier ?

OpenStudy (zale101):

Glacial erosion takes place by abrasion, gouging, plucking and sapping. Ice, itself, does not do much abrasion; but as the ice moves, it gathers boulders, rock fragments, sand, soil which become its cutting tools. http://www.preservearticles.com/2011090212694/glacial-erosion-takes-place-by-abrasion-gouging-plucking-and-sapping.html

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