Which of the following is evidence that an area was once covered by a glacier? a. loess deposits b. v-shaped valley c. u-shaped valley d. alluvial fan

C. U- shaped valley

A U- shaped valley is formed by the process of glaciation. They have characteristic steep, straight sides, a flat or rounded bottom. These valleys are formed when a glacier travel across and down a slope of mountain.  U- shaped valleys are valleys which are formed by carving by glacier. Therefore, it also depicts evidence of region which was previously covered by a glacier.

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