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
The most important reason why summers in the Southern Hemisphere are not warmer than summers in the Northern Hemisphere is that:

Over 80% of the Southern Hemisphere is covered with water
The earth is farther from the sun in July
The sun's energy is less intense in the Southern Hemisphere
The earth is closer to the sun in January

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