Environmental Science
Although the polar regions radiate away more heat energy than they receive by insolation in the course of a year, they are prevented from becoming progressively colder each year by the:

The insulating properties of snow
Concentration of earth's magnetic field lines at the poles
Release of latent heat to the atmosphere when polar ice melts
Circulation of heat by the atmosphere and oceans
Conduction of heat through the interior of the earth

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

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