Environmental Science
During the afternoon the greatest temperature difference between the surface air and the air several meters above occurs on a:

Cloudy, calm afternoon
Clear, windy afternoon
Cloudy, windy afternoon
Clear, calm afternoon

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Environmental Science
During an equinox:

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

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