Environmental Science
Which statement(s) below is/are correct?

All of these
Fog can be composed of ice crystals
Valleys are more susceptible to radiation fog than hill tops
Without the summer fog along the coast of California, redwoods would not grow well there

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

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