News tagged with produces oxygen

Did a nickel famine trigger the 'Great Oxidation Event'?

(PhysOrg.com) -- The Earth's original atmosphere held very little oxygen. This began to change around 2.4 billion years ago when oxygen levels increased dramatically during what scientists call the "Great ...

Space & Earth / Earth Sciences

Apr 08, 2009 | 4.5 / 5 (21) | 3