Environmental Science
How do red and blue light differ?

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

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Environmental Science
Low clouds retard surface cooling at night better than clear skies because:

The water droplets in the clouds reflect infrared energy back to earth
The formation of the clouds releases latent heat energy
The clouds start convection currents between them
The clouds are better conductors of heat than is the clear night air
The clouds absorb and radiate infrared energy back to earth

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