News FocusPaleoceanography

Inconstant Ancient Seas and Life's Path

Science  08 Nov 2002:
Vol. 298, Issue 5596, pp. 1165-1166
DOI: 10.1126/science.298.5596.1165

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Summary

Seawater composition has changed over geological time, geochemists now realize. Has biological evolution changed along with it? A paper in this issue of Science (p. 1222) suggests that oscillations in the chemical composition of the world ocean, likely driven by the varying tempo of plate tectonics, might have helped trigger a number of important evolutionary events.

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