Environmental Science
As the difference between the air temperature and the dew point increases, the relative humidity:

Remains constant at a value less than 100%
Increases
Remains constant and equal to 100%
Decreases

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Environmental Science
Thermal belts are:

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

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