Environmental Science
The earth's radiative equilibrium temperature is:

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
The temperature at which the earth is radiating energy at maximum intensity

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Environmental Science
Our seasons are caused by:

The length of the daylight hours
All of these
Only (b) and (c) are correct
The changing distance between the earth and the sun
The angle at which sunlight reaches the earth

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