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Three of the following favour rapid warm rain formation. Which is the odd one out?

  • A.a high concentration of small cloud droplets
  • B.a broad initial droplet spectrum
  • C.a deep cloud with a long residence time
  • D.the presence of giant condensation nuclei

Answer: A

Numerous small droplets fall together and collide inefficiently, which delays rain. The other three each either broaden the spectrum or give collection more time to work. Spectral breadth and residence time are the two levers available.

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