[holykaw.alltop.com] Earth owes its oxygen to a cooler mantle

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	--- Reply above this line to comment on this post --- Earth owes its oxygen to a cooler mantle Posted by  Futurity to Holy Kaw! New research links the long-ago proliferation of oxygen in Earth’s atmosphere to a sudden change in the inner workings of our planet. Princeton University researchers report that rocks preserved in the Earth’s crust reveal that a steep decline in the intensity of melting within the planet’s mantle brought about ideal conditions for the period known as the Great Oxygenation Event. Full story at Futurity. More research news from top universities. Photo credit: NASA View this post » Leave a comment » Sent by Posterous. Unsubscribe from emails. Other questions? We'd love to help.