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

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

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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:

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

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