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A U-shaped valley with truncated spurs indicates erosion by

  • A.wind
  • B.groundwater solution
  • C.a glacier
  • D.a river

Answer: C

Correct answer: a glacier

Ice fills the valley and erodes its sides as well as its floor, so it deepens and widens the valley into a U and cuts straight through the spurs a river would have wound around, leaving them truncated. Hanging valleys where tributary glaciers joined, and striations on the rock surfaces, complete the diagnosis.

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