Discussion :: Environmental Science
- The earth's first atmosphere was composed primarily of:
|
A.
Carbon dioxide and water vapor |
|
B.
Hydrogen and helium |
|
C.
Oxygen and water vapor |
|
D.
Argon and nitrogen |
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Answer : Option B
Explanation :
At its initial formation, the Earth's first atmosphere was composed primarily of the light elements hydrogen and helium.
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