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Which effect does the descending branch of the Hadley cell produce at the surface?

  • A.The equatorial rain forest, which owes its rainfall to the convergence of the trade winds beneath it
  • B.The polar ice caps
  • C.The mid-latitude storm track, in which travelling cyclones bring frequent frontal rainfall through the year
  • D.The subtropical desert belt

Answer: D

Persistent subsidence near thirty degrees latitude warms and dries the air, suppressing cloud and producing the great deserts of both hemispheres. The distribution of the world's arid zones is thus a direct consequence of the general circulation. Equatorial rain forests lie beneath the ascending branch, and the storm track belongs to the baroclinic mid-latitudes rather than to the Hadley circulation. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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