"In the cases of Jupiter and other gas giants, how can we tell where the atmosphere ends and the solid surface begins?"
Content with the tag: “volcanoes”
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Subaerial Volcanoes Shift Oxygen Levels on Early Earth
Biomarkers in rocks prior to the rise in Earth’s atmospheric oxygen 2.5 billion years ago show cyanobacteria released oxygen at the same levels as today. What was happening to that oxygen? A new paper in this week’s Nature from NAI’s Penn State Team proposes that the rise of atmospheric oxygen occurred because the predominant sink for oxygen—enhanced submarine volcanism—was abruptly and permanently diminished during the Archaean–Proterozoic transition by a shift from predominantly submarine volcanism to a mix of subaerial...
August 30, 2007 / Posted by: Shige Abe
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