Environmental Science
The earth's first atmosphere was composed primarily of:

Carbon dioxide and water vapor
Argon and nitrogen
Hydrogen and helium
Oxygen and water vapor

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

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