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Arrange the stages of the warm rain process in order.
1. collection of smaller droplets by collectors
2. activation of nuclei into cloud droplets
3. breakup limiting the largest drops
4. diffusional growth to about twenty micrometres

  • A.2 - 1 - 4 - 3
  • B.2 - 4 - 1 - 3
  • C.3 - 1 - 4 - 2
  • D.4 - 2 - 1 - 3

Answer: B

Each stage hands over to the next at a fairly well defined size. The transition from the second to the third is the difficult step that the whole subject is organised around. Everything before it is slow and everything after it is fast.

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