Environmental Science
At middle latitudes, the base of an altostratus or altocumulus cloud would generally be found between:

23,000 and 43,000 feet
Above 43,000 feet
6,500 and 23,000 feet
200 and 6,500 feet

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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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