Environmental Science
The atmosphere near the earth's surface is "heated from below." Which of the following does not significantly contribute to this heating?

Conduction of heat upward from a hot surface
Absorption of infrared energy that has been radiated from the surface
Convection from a hot surface
Heat energy from the earth's interior

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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:

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
Conduction of heat through the interior of the earth

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