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Insolation weathering arises from

  • A.the growth of ice in joints
  • B.the dissolving action of rainwater
  • C.repeated thermal expansion and contraction
  • D.the chemical action of sunlight on minerals

Answer: C

Different minerals expand by different amounts and the surface heats more than the interior, setting up stresses at each daily cycle. Its effectiveness alone is debated, but it certainly assists other processes in deserts.

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