Environmental Science
At night, low clouds:

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

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Environmental Science
The Gulf Coast states are more humid in summer than the coastal areas of Southern California mainly because of the:

Higher water temperature in the Gulf of Mexico
Low relative humidity of the air over the Pacific Ocean
Lower air temperature in Southern California
Higher air temperature in the Gulf States

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