Environmental Science
The albedo of the earth's surface is only about 4%, yet the combined albedo of the earth and the atmosphere is about 30%. Which set of conditions below best explains why this is so?

High albedo of clouds, high albedo of water
Low albedo of clouds, high albedo of water
High albedo of clouds, low albedo of water
Low albedo of clouds, low albedo of water

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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.
Red light has a higher intensity.
The wavelength of red light is longer.

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