Environmental Science
The wind-chill factor:

Relates body heat loss with wind to an equivalent temperature with no wind
Takes into account humidity and air temperature in expressing the current air temperature
Tells farmers when to protect crops from a freeze
Indicates the temperature at which water freezes on exposed skin
Determines how low the air temperature will be on any given day

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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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