Frost forms when:
A
Objects on the ground cool below the dew point temperature.
B
The dew point is 32<sup>o</sup>F or below.
C
Water vapor changes into ice without first becoming a liquid.
D
All of the above
Correct Answer: All of the above
Frost forms when an outside surface cools past the dew point. The dew point is the point where the air gets so cold, the water vapour in the atmosphere turns into liquid.