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 | Hmmm, I think the gases came from the spewing volcanoes after the Molten Earth cooled down. | |
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| Do you know the elements the volcanic eruptions had? | |
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| I believe the main three were hot water vapor, carbon dioxide, and sulfur dioxide. | |
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| And then the carbon dioxide dissolved into the oceans right? | |
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| Yes, and living things began to photosynthesize and removed the carbon dixoide into oxygen. | |
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