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

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

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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?

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

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Environmental Science
At night, low clouds:

Are often caused by the atmospheric greenhouse effect
Enhance the atmospheric greenhouse effect
Have no effect on the atmospheric greenhouse effect
Weaken the atmospheric greenhouse effect

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