Environmental Science
Thermal belts are:

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

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Environmental Science
During an equinox:

All of these
At noon the sun is overhead at the equator
The earth is not tilted toward nor away from the sun
The days and nights are of equal length except at the poles

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