Volcanic Activity Key to Oxygen-rich Atmosphere

Next time you catch a breath, be thankful, for a change, that the Earth's surface is dotted with volcanoes.

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<p><a href="http://www.physorg.com/news107623419.html">Volcanic Activity Key to Oxygen-rich Atmosphere</a></p> <p>Next time you catch a breath, be thankful, for a change, that the Earth's surface is dotted with volcanoes.</p>