Environmental Science
During an equinox:

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

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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
Absorption of infrared energy that has been radiated from the surface
Convection from a hot surface

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