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Precipitation requires above all that air be

  • A.cooled below its dew point
  • B.warmed above its dew point instead
  • C.compressed rather than expanded
  • D.brought entirely to rest

Answer: A

Rising air expands and cools, and condensation follows once saturation is reached. Every precipitation mechanism is essentially a way of making air rise. Expansion does the cooling. Saturation is reached as the parcel rises.

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