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Evaporation of falling rain below the cloud base

  • A.leaves the sub-cloud layer unchanged
  • B.increases the mass of the falling drops
  • C.cools and moistens the sub-cloud layer
  • D.warms and dries the sub-cloud layer

Answer: C

Latent heat is absorbed from the air and water vapour is added to it. The cooling drives downdraughts and the moistening reduces the evaporation of subsequent rain. The layer therefore becomes progressively more favourable.

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