Environmental Science
At night, low clouds:

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

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Environmental Science
Which of the following statements is not correct?

During the winter, low relative humidity can irritate the mucus membranes in the nose and throat.
A change in the air temperature can change the relative humidity.
The relative humidity is a measure of the air's actual water vapor content.
The length of human hair changes as the relative humidity changes.

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