Environmental Science
How do red and blue light differ?

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

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Environmental Science
Infrared and visible satellite images might provide:

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

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