Environmental Science
The earth's radiative equilibrium temperature is:

The temperature at which the earth is absorbing solar radiation and emitting infrared radiation at equal rates
The temperature at which the earth is radiating energy at maximum intensity
The temperature at which rates of evaporation and condensation on the earth are in balance
The average temperature the earth must maintain to prevent the oceans from freezing solid

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Environmental Science
Thermal belts are:

Warmer hillsides that are less likely to experience freezing conditions
Cold, below-freezing air found at the top of a mountain
Pockets of cold air resting on a valley floor at night
Pockets of warm air resting on a valley during the afternoon

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