Environmental Science
Typically, water vapour occupies about what percentage of the air's volume near the earth's surface?

Less than 4 percent
Close to 10 percent
About 21 percent
None of these
About 78 percent

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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 the earth is radiating energy at maximum intensity
The temperature at which the earth is absorbing solar radiation and emitting infrared radiation at equal rates
The temperature at which rates of evaporation and condensation on the earth are in balance

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