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Consider the following pairs of region and vertical motion.

Ahead of a warm front - ascent

Behind a cold front - descent

Right entrance of a jet streak - ascent

Centre of an anticyclone - ascent

How many of the pairs given above are correctly matched?

  • A.All four
  • B.Only three
  • C.Only one
  • D.Only two

Answer: B

The centre of an anticyclone is a region of subsidence, produced by frictional divergence at the surface, so the last pairing is wrong. The other three are correct. Assembling the standard regions of ascent and descent into a single mental map is one of the most practically useful things this topic offers, since it converts a chart directly into a cloud and rainfall forecast.

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