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

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

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

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