Environmental Science
The atmospheric greenhouse effect is produced mainly by the:

Absorption and re-emission of infrared radiation by the atmosphere
Absorption and re-emission of ultraviolet radiation by the atmosphere
Absorption and re-emission of visible light by the atmosphere
Absorption and re-emission of visible light by clouds
Absorption and re-emission of visible light by the ground

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

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