Discussion :: Environmental Science
- In a volume of air near the earth's surface, ____ occupies 78 percent and ____ nearly 21 percent.
|
A.
Nitrogen, oxygen |
|
B.
Hydrogen, oxygen |
|
C.
Oxygen, hydrogen |
|
D.
Nitrogen, water vapor |
|
E.
Hydrogen, helium |
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Answer : Option A
Explanation :
In a volume of air near the earth's surface, nitrogen occupies 78 percent and oxygen nearly 21 percent.
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