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A V-shaped valley indicates erosion by

  • A.wave action
  • B.a river
  • C.a glacier
  • D.wind

Answer: B

Correct answer: a river

A river cuts downward in a narrow channel while the valley sides are worn back by weathering and slope processes, giving the characteristic V cross-section with interlocking spurs where the river winds. A glacier occupies the whole valley floor and erodes the sides as well as the bed, which straightens and deepens it into the quite different U shape.

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