Environmental Science
Warming in the stratosphere is mainly caused by:

Absorption of ultraviolet radiation by ozone
Chemical reactions between ozone and chlorofluorocarbons
Release of latent heat energy during condensation
Frictional heating caused by meteorites

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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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