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All of the following are mechanisms that lift air and produce precipitation EXCEPT

  • A.subsidence in a high pressure area
  • B.convection over a heated surface
  • C.forced ascent over a mountain range
  • D.convergence at a front

Answer: A

Subsidence is descent and suppresses precipitation entirely, which is why the great deserts sit beneath the subtropical highs. The other three are the three principal ways in which air is made to rise and therefore to cool below its dew point.

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