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26 February, 19:35

Select all of the answers that apply. Which of the following factors caused the early atmosphere to become thicker? volcanic outgassing meteorite and comet impacts cyanobacteria banded iron formations

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  1. 26 February, 19:44
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    Volcanic outgassing

    Cyanobacteria banded iron formation

    I think this is correct but I am not fully sure
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