Environmental Science
Most harmful environmental pollutants are

non-biodegradable chemicals
natural nutrients in excess
waste animal feed
human organic wastes

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Environmental Science
Frost forms when:

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

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Environmental Science
The Gulf Coast states are more humid in summer than the coastal areas of Southern California mainly because of the:

Higher air temperature in the Gulf States
Higher water temperature in the Gulf of Mexico
Lower air temperature in Southern California
Low relative humidity of the air over the Pacific Ocean

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