Environmental Science
The largest annual ranges of temperatures are found:

At the Equator
At polar latitudes over water
At middle latitudes near large bodies of water
In the Northern Central Plains of the United States
At polar latitudes over land

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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:

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

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