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The first atmosphere would have consisted of gases in the solar nebula, primarily hydrogen. In addition there would probably have been simple hydrides such as are now found in gas-giant planets like Jupiter and Saturn, notably water vapor, methane and ammonia.

The next atmosphere, probably consisting largely of nitrogen (partly in the form of ammonia), carbon dioxide,water vapor and other gases, but no free oxygen. This amosphere was produced by outgassing from volcanism, supplemented by gases produced during the late heavy bombardment of Earth by huge asteroids.

Free oxygen did not exist until about 1.7 billion years ago (thank you plants).

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11y ago
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11y ago

Carbon dioxide was the most abundant gas in the early atmosphere but now it is nitrogen which is about 71%. The other gases that are in the air are oxygen which is approximately 20%, carbon dioxide which is 0.04%, argon (noble gas) which is 0.9% and water vapour.

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Q: What were the most abundant gases that made up earths early atmosphere?
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