Environmental Science
The aurora is produced by:

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

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

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

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