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Three of the following are precipitation types formed through the ice phase. Which is the odd one out?

  • A.rain that began as snow high aloft
  • B.drizzle from a shallow maritime stratocumulus
  • C.snow reaching the ground still unmelted
  • D.hail produced by a severe convective storm

Answer: B

Correct answer: drizzle from a shallow maritime stratocumulus

Shallow maritime stratocumulus is warmer than freezing throughout, so its drizzle forms by collision and coalescence alone - the warm rain process. The other three all pass through the ice phase: rain that began as snow, snow that reached the ground unmelted, and hail grown by riming in a convective updraught.

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