Environmental Science
Thermal belts are:

Pockets of cold air resting on a valley floor at night
Cold, below-freezing air found at the top of a mountain
Warmer hillsides that are less likely to experience freezing conditions
Pockets of warm air resting on a valley during the afternoon

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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.
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.
A change in the air temperature can change the relative humidity.

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