Environmental Science
Where cold surface air replaces warm air, the boundary separating the different bodies of air is:

A cold front
A tornado
A warm front
A parallel of latitude

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Environmental Science
Thermal belts are:

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

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