Environmental Science
The wind-chill factor:

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
Determines how low the air temperature will be on any given day
Indicates the temperature at which water freezes on exposed skin

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Environmental Science
Infrared and visible satellite images might provide:

A way of identifying clouds suitable for cloud seeding.
A way of distinguishing between "new" and "old" clouds.
A way of distinguishing between wet and dry clouds.
A way of determining cloud thickness and altitude.

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Environmental Science
Which of the following statements is not correct?

The length of human hair changes as the relative humidity changes.
A change in the air temperature can change the relative humidity.
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.

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