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A rain shadow forms on the leeward side of a mountain range because

  • A.the prevailing wind reverses direction at the crest
  • B.descending air warms and its relative humidity falls
  • C.the mountain physically blocks the passage of rain
  • D.the air becomes colder as it descends the slope

Answer: B

Much of the moisture is lost as precipitation on the windward ascent, and the descending air then warms adiabatically. It arrives on the far side both drier in absolute terms and further from saturation than before it began.

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