Environmental Science
As the difference between the air temperature and the dew point increases, the relative humidity:

Remains constant at a value less than 100%
Increases
Decreases
Remains constant and equal to 100%

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Environmental Science
Frost forms when:

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.
All of these

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