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The radiant energy received by the earth and its atmosphere from the sun is called:

  • A.Insolation
  • B.Isotherm
  • C.Insoenergy
  • D.Albedo

Answer: A

This is insolation, short for incoming solar radiation.

The earth intercepts only about a two-billionth of the sun's output, and of that roughly half reaches the surface, the rest being reflected or absorbed by the atmosphere. Insolation varies with latitude, season and cloud, and is the ultimate driver of climate.

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