Neptune's Outer Atmosphere Is Mainly Comprised Of Helium And What Other Gas?

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Difficulty
Hard

Neptune’s Outer Atmosphere Is Mainly Comprised Of Helium And What Other Gas?

Question:
Neptune's Outer Atmosphere Is Mainly Comprised Of Helium And What Other Gas?
a)
Hydrogen
b)
Nitrogen
c)
Helium
d)
Oxygen

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Correct Answer
Hydrogen
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