Environmental Science
The temperature to which air must be cooled in order to become saturated is the:

Wet-bulb temperature
Minimum temperature
Freezing point
Dew point temperature

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Environmental Science
Infrared and visible satellite images might provide:

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

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Environmental Science
How do red and blue light differ?

Blue light has a higher speed of propagation.
The wavelength of red light is longer.
Red light has a higher intensity.
Red and blue light have different directions of polarization.

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