Environmental Science
Biogas is composed of

carbon dioxide, nitrogen and hydrogen
methane, carbon dioxide, nitrogen and sulphur
methane, carbon dioxide, nitrogen and hydrogen
ethane, carbon dioxide, nitrogen and hydrogen

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Environmental Science
The primary cause of a radiation inversion is:

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

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