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Cloud droplets remain suspended rather than falling immediately because

  • A.their terminal velocity is small compared with typical updraughts
  • B.they carry an electric charge that holds them against gravity
  • C.they are appreciably lighter than the air surrounding them
  • D.surface tension prevents them from moving downward at all

Answer: A

A typical cloud droplet of about twenty micrometres falls at only a centimetre or so per second, which even a weak updraught exceeds. Growth to a much larger size is required before a droplet can leave the cloud as precipitation.

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