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

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

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Environmental Science
The lag in daily temperature refers to the time lag between the:

Minimum and maximum solar energy received at the surface for a given day
Minimum and maximum temperature for a day
Time of minimum temperature and the time of maximum solar radiation
Time of maximum solar radiation and the time of maximum temperature
Sunrise and sunset

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