Environmental Science
Thermal belts are:

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

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Environmental Science
Much of Tibet lies at altitudes over 18,000 feet where the pressure is about 500 mb. At such altitudes, the Tibetans are above roughly:

25% of the air molecules in the atmosphere
10% of the air molecules in the atmosphere
75% of the air molecules in the atmosphere
50% of the air molecules in the atmosphere

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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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