Environmental Science
The gas that absorbs most of the harmful ultraviolet radiation in the stratosphere:

Ozone
Carbon dioxide
Chlorofluorocarbons
Water vapor
Nitrous oxide

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Environmental Science
At night, low clouds:

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

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Environmental Science
During an equinox:

All of these
At noon the sun is overhead at the equator
The earth is not tilted toward nor away from the sun
The days and nights are of equal length except at the poles

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