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The seeder feeder mechanism enhances rainfall over hills by

  • A.increasing how many condensation nuclei the air holds
  • B.making the drops that form descend more slowly
  • C.ice or rain from an upper cloud sweeping out a lower orographic cloud
  • D.the hill cooling the air that passes directly over it

Answer: C

Correct answer: ice or rain from an upper cloud sweeping out a lower orographic cloud

A shallow cap cloud over a hill contains liquid water but is too thin to grow drops large enough to fall. When precipitation from a deeper cloud above falls through it, those particles collect the small droplets on the way down and arrive at the surface much enlarged. The seeder supplies the particles and the feeder supplies the water, and neither alone would produce the rainfall that results.

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