Environmental Science
Suppose it is a winter night and at about 11 p.m., the air cools to the dew-point temperature and a thick radiation fog develops. If the air continues to cool during the night, in 5 hours the dew point temperature will probably:

Decrease as the air becomes moister
Increase as the air becomes moister
Decrease as the air becomes drier
Increase as the air becomes drier

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Environmental Science
Biogas is composed of

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

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