Environmental Science
In the northern hemisphere, the number of hours of daylight begin to shorten after the

Autumn equinox
Winter solstice
Summer solstice
Spring equinox

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Environmental Science
The earth's radiative equilibrium temperature is:

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 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

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