Environmental Science
The earth's radiative equilibrium temperature is:

The average temperature the earth must maintain to prevent the oceans from freezing solid
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 temperature at which the earth is radiating energy at maximum intensity

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Environmental Science
Frost forms when:

The dew point is 32oF or below.
All of these
Water vapor changes into ice without first becoming a liquid.
Objects on the ground cool below the dew point temperature.

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