Environmental Science
The wind-chill factor:

Indicates the temperature at which water freezes on exposed skin
Determines how low the air temperature will be on any given day
Takes into account humidity and air temperature in expressing the current air temperature
Relates body heat loss with wind to an equivalent temperature with no wind
Tells farmers when to protect crops from a freeze

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Environmental Science
Frost forms when:

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

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Environmental Science
The atmospheric greenhouse effect is produced mainly by the:

Absorption and re-emission of infrared radiation by the atmosphere
Absorption and re-emission of visible light by the atmosphere
Absorption and re-emission of visible light by the ground
Absorption and re-emission of visible light by clouds
Absorption and re-emission of ultraviolet radiation by the atmosphere

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