Environmental Science
How do red and blue light differ?

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

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Environmental Science
The atmosphere near the earth's surface is "heated from below." Which of the following does not significantly contribute to this heating?

Heat energy from the earth's interior
Absorption of infrared energy that has been radiated from the surface
Convection from a hot surface
Conduction of heat upward from a hot surface

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