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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Environmental Science
Low clouds retard surface cooling at night better than clear skies because:

The water droplets in the clouds reflect infrared energy back to earth
The clouds start convection currents between them
The formation of the clouds releases latent heat energy
The clouds absorb and radiate infrared energy back to earth
The clouds are better conductors of heat than is the clear night air

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