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

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

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Environmental Science
Infrared and visible satellite images might provide:

A way of distinguishing between wet and dry clouds.
A way of distinguishing between "new" and "old" clouds.
A way of determining cloud thickness and altitude.
A way of identifying clouds suitable for cloud seeding.

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Environmental Science
During an equinox:

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

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