Environmental Science
Typically, water vapour occupies about what percentage of the air's volume near the earth's surface?

About 21 percent
Less than 4 percent
None of these
Close to 10 percent
About 78 percent

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

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