Environmental Science
During the afternoon the greatest temperature difference between the surface air and the air several meters above occurs on a:

Clear, calm afternoon
Cloudy, calm afternoon
Clear, windy afternoon
Cloudy, windy afternoon

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Environmental Science
The wind-chill factor:

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
Tells farmers when to protect crops from a freeze
Indicates the temperature at which water freezes on exposed skin
Takes into account humidity and air temperature in expressing the current air temperature

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