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When the earth was formed, volcanoes were commonplace. These volcanoes released water vapor into the air, and produced gases filled with nitrogen, hydrogen, and carbon. The planet's atmosphere consisted of these gases and at the time, there was no free oxygen.

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Q: Which gas was not present on earth at its formation 4.6 billion years ago out of methane water vapour oxygen and nitrogen?
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What were the gases on earth 4.4 billion years ago?

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