Environmental Science
The wind-chill factor:

Tells farmers when to protect crops from a freeze
Relates body heat loss with wind to an equivalent temperature with no wind
Determines how low the air temperature will be on any given day
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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Environmental Science
Which of the following statements is not correct?

During the winter, low relative humidity can irritate the mucus membranes in the nose and throat.
The length of human hair changes as the relative humidity changes.
The relative humidity is a measure of the air's actual water vapor content.
A change in the air temperature can change the relative humidity.

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