Environmental Science
In a volume of air near the earth's surface, ____ occupies 78 percent and ____ nearly 21 percent.

Oxygen, hydrogen
Nitrogen, water vapor
Nitrogen, oxygen
Hydrogen, oxygen
Hydrogen, helium

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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:

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

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