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Arrange these stages of warm cloud droplet development in order.
1. slowing growth and narrowing of the spectrum
2. activation of nuclei just above cloud base
3. onset of collision and coalescence
4. rapid initial diffusional growth to a few micrometres

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

Answer: D

The sequence shows where the difficulty lies, since the third stage must somehow give way to the fourth. Everything interesting about warm rain formation happens at that transition. Models are judged largely on how well they reproduce it.

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