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JRÂ Â Â GraybeardIrv SAnthony Recent comment authors
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JR
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JR

The thermopause is the atmospheric boundary of Earth’s energy system, located at the top of the thermosphere.

Therefore based on the choices i have to go with the Thermopause as it is at the outer boundary of Earth’s atmosphere.

http://en.wikipedia.org/wiki/Thermopause

  Â
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  Â

1. Earth’s surface is covered with atmosphere.

2. Same as above.

3. This one.

4. Clouds are also inside Earth’s atmosphere.

By process of elimination, it’s clear the answer is 3. Thermopause represents the outer edge of Earth’s atmosphere, the point beyond which there are essentially no heavier molecules.

Graybeard
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Graybeard

Reflected at the thermopause (the upper surface of the atmosphere). Not a good answer, but none of the others fit the question.

Irv S
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Irv S

None of those can ‘happen’ before it enters the atmosphere can they?
Rethink that question.

Anthony
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Anthony

Simple enough. The earth’s surface is BENEATH the atmosphere, so that rules out being radiated or absorbed. Same thing with clouds. The thermopause, however, is at the very top of the atmosphere. So, it’s that one. 😀