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Which of the following is generally true about the stratosphere?

  • A.It is very dry
  • B.It is very moist
  • C.The dryness level varies with the season
  • D.The dryness level varies with the moon cycle

Answer: A

The stratosphere is very dry. Almost no water vapour reaches it, because air rising through the tropopause is chilled to about −60°C and its moisture freezes out first.

The layer is also very stable, with temperature rising with height, so there is little vertical mixing to carry moisture up. This is why jet aircraft cruise there in cloudless air.

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