Environmental Science
The wind-chill factor:

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

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Environmental Science
At night, low clouds:

Enhance the atmospheric greenhouse effect
Are often caused by the atmospheric greenhouse effect
Have no effect on the atmospheric greenhouse effect
Weaken the atmospheric greenhouse effect

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