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Large volcanic eruptions blast mercury gas into the upper atmosphere, where today it circulates for a year or two before raining out onto Earth s surface. The new analysis showed a spike in mercury a few million years before the temporary rise in oxygen. Volcanic Eruptions Might Have Created Oxygen in Atmosphere, Say Researchers.

Mount mcraeWestern australiaUnited statesJana meixnerovaJoel blumAriel anbar at arizona state universityUniversity of washingtonProceedings of the national academy sciencesSpace sciencesUniversity of michiganNational academyAriel anbarArizona state universityMount mcrae shaleRoger buickAustralian rocks