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 absorbing solar radiation and emitting infrared radiation at equal rates
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

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Environmental Science
Our seasons are caused by:

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

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