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

Nitrate fertilizers
Nitrogen fixing bacteria
Denitrifying bacteria
Nitrifying bacteria

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Environmental Science
The primary cause of a radiation inversion is:

Solar radiation reflected by the earth's surface
Solar radiation absorbed by the earth's surface
Infrared radiation absorbed by the earth's surface
Infrared radiation emitted by the earth's surface
Infrared radiation absorbed by the atmosphere and clouds

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