Environmental Science
Fog that most often forms as warm rain falls into a cold layer of surface air is called:

Radiation fog
Advection fog
Evaporation (mixing) fog
Upslope fog

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Environmental Science
Frost forms when:

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

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