Environmental Science
In most areas, the warmest time of the day about 5 feet above the ground occurs:

Just before the sun sets
In the early evening after 6 PM
In the afternoon between 3 and 5 PM
Around noon

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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
Circulation of heat by the atmosphere and oceans
The insulating properties of snow

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