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Around four hundred million years after the formation of Earth, the planet's atmosphere would have been almost entirely
Around four hundred million years after the formation of Earth, the planet's atmosphere would have been almost entirely carbon dioxide.
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Asked 4/29/2012 9:41:43 PM
Updated 7/9/2018 2:44:58 AM
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Around four hundred million years after the formation of Earth, the planet's atmosphere would have been almost entirely carbon dioxide.

Added 7/9/2018 2:44:58 AM
This answer has been confirmed as correct and helpful.
Confirmed by Masamune [7/9/2018 7:17:54 AM]
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