Environmental Science
Which of the following statements is not correct?

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

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Environmental Science
During an equinox:

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

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