Environmental Science
During the winter solstice in the Northern Hemisphere:

The noon sun is overhead at 23.5o S latitude
Astronomical winter begins in the Northern Hemisphere
At middle latitudes in the Northern Hemisphere, this marks the longest night of the year
All of these

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

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