Environmental Science
Nitrogen gas returns to the atmosphere by the action of

Nitrifying bacteria
Nitrate fertilizers
Nitrogen fixing bacteria
Denitrifying bacteria

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Environmental Science
Thermal belts are:

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

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