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Riming occurs when

  • A.two ice crystals collide and stick to one another
  • B.vapour deposits directly onto an existing crystal surface
  • C.a falling snowflake partially melts and then refreezes
  • D.supercooled droplets freeze on contact with a falling crystal

Answer: D

The accreted droplets freeze almost instantly and coat the crystal in opaque rime. Heavy riming eventually obscures the original habit and produces graupel instead. Riming is the route by which a crystal becomes a dense pellet.

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