Environmental Science
The north-facing side of a hill in a mountainous region in the US tends to:

Have snow on the ground for a longer period of time in winter compared to the south-facing side
All of these
Grow a variety of trees that are typically observed at higher elevation
Be a better location for a ski run than the south-facing side
Receive less sunlight during a year than the south-facing side

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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 rates of evaporation and condensation on the earth are in balance
The temperature at which the earth is radiating energy at maximum intensity
The temperature at which the earth is absorbing solar radiation and emitting infrared radiation at equal rates

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