What is a glacial erratic, and how can scientists use this feature to learn about a glacier?
A glacial erratic is a rock that has been eroded by a glacier and deposited some distance from its source. Erratics are compositionally dissimilar to the bedrock in the area of deposition.
By determining the likely source for an erratic, scientists can estimate the extent of historical glaciation.
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What will be an ideal response?
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a. ?air pressure. b. ?air temperature. c. ?air density. d. ?wind speed. e. ?chemical composition.
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