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quote:
"Air at low altitudes is warmer in the first place because it is warmed by heat radiation from the earth."
Air at lower altitudes is warmer because the surface of the earth is warmed from the sun's radiant heat. As global/local winds convect, the "water vapor/gas mix" (we call air) absorbs heat from the surface of the earth in an attempt to reach equilibrium. Law of thermodynamics, heat flows from zones of higher energy to those of lower energy.
-SF
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