Environmental Science
Condensation nuclei may be:

All of these
Particles of dust
Salt from the ocean
Smoke from forest fires
Nitric acid particles

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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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