Environmental Science
Biogas is composed of

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

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Environmental Science
Frost forms when:

Water vapor changes into ice without first becoming a liquid.
Objects on the ground cool below the dew point temperature.
The dew point is 32oF or below.
All of these

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