Environmental Science
Frost forms when:

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

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Environmental Science
Our seasons are caused by:

The angle at which sunlight reaches the earth
All of these
The length of the daylight hours
The changing distance between the earth and the sun
Only (b) and (c) are correct

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