Environmental Science
Frost forms when:

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

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Environmental Science
During the winter solstice in the Northern Hemisphere:

At middle latitudes in the Northern Hemisphere, this marks the longest night of the year
Astronomical winter begins in the Northern Hemisphere
The noon sun is overhead at 23.5o S latitude
All of these

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