Environmental Science
Frost forms when:

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

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Environmental Science
The primary cause of a radiation inversion is:

Infrared radiation absorbed by the atmosphere and clouds
Infrared radiation emitted by the earth's surface
Solar radiation absorbed by the earth's surface
Solar radiation reflected by the earth's surface
Infrared radiation absorbed by the earth's surface

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