Environmental Science
As the air temperature increases, the air's capacity for water vapour:

Increases
Decreases
Is unrelated to air temperature and can either increase or decrease
Remains constant

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Environmental Science
At night, low clouds:

Are often caused by the atmospheric greenhouse effect
Weaken the atmospheric greenhouse effect
Enhance the atmospheric greenhouse effect
Have no effect on the atmospheric greenhouse effect

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

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