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A radiation inversion forms typically

  • A.On windy overcast afternoons
  • B.During heavy rainfall
  • C.Only over the sea in summer
  • D.On clear calm nights, as the ground cools

Answer: D

The surface cools faster than the air above it, so the lowest layer becomes the coldest. It breaks up soon after sunrise as the ground warms again, which is why morning traffic emissions are trapped and afternoon ones are not.

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