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

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Environmental Science
An important reason for the large daily temperature range over deserts is:

The light-colored sand radiates heat very rapidly at night
There is little water vapor in the air to absorb and re-radiate infrared radiation
Dry air is a very poor heat conductor
The ozone content of desert air is very low
Free convection cells are unable to form above the hot desert ground

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