The primary atmospheres of the planets are made mostly of
A) carbon and oxygen.
B) hydrogen and helium.
C) iron and nickel.
D) nitrogen and argon.

Name: The primary atmospheres of the planets are made mostly of A) carbon and oxygen. B) hydrogen and helium. C) iron and nickel. D) nitrogen and argon.
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The primary atmospheres of the planets are thought to have been primarily composed of the gases present in the pre-solar nebula, which were mostly hydrogen and helium.

The Primary Atmospheres of the Planets Are Made Mostly of