Environmental Science
The earth's radiative equilibrium temperature is:

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 temperature at which the earth is absorbing solar radiation and emitting infrared radiation at equal rates
The average temperature the earth must maintain to prevent the oceans from freezing solid

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

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