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The reconstructed history of North Atlantic nitrogen fixation (black) is partly driven by the cyclic wobble of the Earth's axis of rotation (orange) and its effect on equatorial Atlantic upwelling.
09/17/13

 

The reconstructed history of North Atlantic nitrogen fixation (black) is partly driven by the cyclic wobble of the Earth's axis of rotation (orange) and its effect on equatorial Atlantic upwelling. Credit: Image courtesy of Daniel Sigman, Department of Geosciences



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