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Precipitation reaches the ground only when hydrometeors

  • A.grow large enough to fall faster than the updraught
  • B.become lighter than the surrounding air
  • C.acquire an electric charge of the correct sign
  • D.reach exactly the temperature of the air around them

Answer: A

A cloud droplet falls too slowly to escape and evaporates on the way down. Growth by roughly a factor of a hundred in radius is required before a particle can leave the cloud and survive the descent. Everything in the subject turns on reaching that size.

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