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Carbon Cycle Reaches Earth's Lower Mantle: Evidence of Carbon Cycle Found in 'Superdeep' Diamonds From Brazil

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ScienceDaily (Sep. 15, 2011) — The carbon cycle, upon which most living things depend, reaches much deeper into Earth than generally supposed -- all the way to the lower mantle, researchers report.

http://www.sciencedaily.com/releases/2011/09/110915141227.htm
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