Environmental Science
During an equinox:

At noon the sun is overhead at the equator
The earth is not tilted toward nor away from the sun
All of these
The days and nights are of equal length except at the poles

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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?

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

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