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
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
The Gulf Coast states are more humid in summer than the coastal areas of Southern California mainly because of the:

Higher air temperature in the Gulf States
Higher water temperature in the Gulf of Mexico
Low relative humidity of the air over the Pacific Ocean
Lower air temperature in Southern California

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