Environmental Science
The deepest radiation inversion would be observed:

On a desert in winter
In polar regions in winter
At the equator any day of the year
In a deep valley during the summer
At the top of a high mountain in winter

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Environmental Science
At night, low clouds:

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

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