Environmental Science
Frost forms when:

All of these
Water vapor changes into ice without first becoming a liquid.
The dew point is 32oF or below.
Objects on the ground cool below the dew point temperature.

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Environmental Science
During an equinox:

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

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