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Three of the following are genera of the low étage. Which is the odd one out?

  • A.stratus
  • B.stratocumulus
  • C.cumulus
  • D.altocumulus

Answer: D

Altocumulus belongs to the middle étage as its prefix indicates. The other three all have bases typically below two kilometres and are conventionally grouped together. The prefix is a reliable guide to the étage in almost every case.

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