Environmental Science
The primary source of energy for the earth's atmosphere is:

Energy from within the earth
Erupting volcanoes
Lightning discharges associated with thunderstorms
The sun
Latent heat released during the formation of hurricanes

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Environmental Science
Frost forms when:

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

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