Environmental Science
The primary cause of a radiation inversion is:

Infrared radiation absorbed by the earth's surface
Infrared radiation emitted by the earth's surface
Solar radiation absorbed by the earth's surface
Infrared radiation absorbed by the atmosphere and clouds
Solar radiation reflected by the earth's surface

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Environmental Science
At night, low clouds:

Have no effect on the atmospheric greenhouse effect
Weaken the atmospheric greenhouse effect
Are often caused by the atmospheric greenhouse effect
Enhance the atmospheric greenhouse effect

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