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Roughly how long does the collection process take to produce raindrops once collectors of twenty micrometres exist?

  • A.a few milliseconds
  • B.several hours at least
  • C.tens of minutes
  • D.several days

Answer: C

Collection accelerates as the collector grows, so the later stages proceed quickly. This is what reconciles theory with the observation that warm cumulus can rain within half an hour of forming. Condensation alone would need several times that interval.

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