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It is decreased and air starts moving up into the atmosphere from the ground.
Air pressure tends to increase as air gets lower in the atmosphere simply because the lower the air is, the more air there is on top of it, and that's what causes air pressure, the weight of the air. And when air is under more pressure, it naturally gets compressed. Air also tends to be warmed by proximity to the ground because it is the ground that is warmed by sunlight. Sunlight does not warm air directly since air is transparent (at least in the visible wavelengths).
Inhaled air is warmed and moistened in the nasopharynx and oropharynx.
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The air is hottest just above the ground.
In the air above the target
It doesn't really come from anywhere. High pressure can form anywhere when air from aloft converges aloft and then is pushed downwards, compressed, and warmed. The air then divereges at ground level. Usually the air that has been compressed and warmed doesn't have any clouds because in the process of being warmed, clouds dissipate from the compressional warming. Hope this helped!
greenhouse effect
The Greenhouse Effect!
greenhouse effect
greenhouse effect
greenhouse effect