Environmental Science
At the North Pole the sun will rise above the horizon on ____ and set below the horizon on ____.

September 23; December 22
March 21; December 22
June 22; September 23
June 22; December 22
March 21; September 23

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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:

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

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