The troposphere is the warmest layer relative to the layers immediately above it because it is heated directly by the Earth’s surface. Sunlight passes through the air and warms the ground, which then radiates heat back into the lower atmosphere. ...
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The atmosphere is primarily heated by radiation from the Earth rather than direct solar rays. While shortwave solar radiation passes through the air, the Earth absorbs this energy and re-emits it as longwave terrestrial radiation. This heat is then trapped ...