Environmental Science
Thermal belts are:

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

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Environmental Science
At night, low clouds:

Weaken the atmospheric greenhouse effect
Have no effect on the atmospheric greenhouse effect
Enhance the atmospheric greenhouse effect
Are often caused by the atmospheric greenhouse effect

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