Environmental Science
The wind-chill factor:

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

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Environmental Science
When clouds are viewed near the horizon, the individual cloud elements usually:

Appear to have more vertical development than is actually the case
Appear lighter in color than is actually the case
Appear closer together than is actually the case
Appear farther apart than is actually the case

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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 relative humidity is a measure of the air's actual water vapor content.
The length of human hair changes as the relative humidity changes.
A change in the air temperature can change the relative humidity.

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