Environmental Science
The main reason(s) for warm summers in northern middle latitudes is that:

All of these
Only (b) and (c) are correct
The sun is higher in the sky and we receive more direct solar radiation
The days are longer
The earth is closer to the sun in summer

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Environmental Science
Which of the following statements is not correct?

A change in the air temperature can change the relative humidity.
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.
The relative humidity is a measure of the air's actual water vapor content.

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