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The first major source of oxygen gas was - volcanic outgassing. meteorite impacts. cyanobacteria. banded iron formations.
The first major source of oxygen gas was: volcanic outgassing.
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Asked 6/5/2013 12:05:40 PM
Updated 4/26/2016 10:45:09 AM
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Flagged by Janet17 [4/26/2016 10:28:47 AM], Unflagged by jeifunk [4/26/2016 10:44:44 AM], Edited by jeifunk [4/26/2016 10:44:46 AM], Edited by jeifunk [4/26/2016 10:45:09 AM]
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The first major source of oxygen gas was: volcanic outgassing.
Added 4/26/2016 10:29:05 AM
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