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

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Environmental Science
The aurora is produced by:

Scattering of sunlight in the upper atmosphere
Fast-moving charged particles colliding with air molecules
Burning oxygen caused by the intense sunlight at high altitude
The combination of molecular and atomic oxygen to form ozone
Reflections of sunlight by polar ice fields

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