Looking Back to Early Mars, Deep Into Earth

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Science  14 Jan 2000:
Vol. 287, Issue 5451, pp. 218-219
DOI: 10.1126/science.287.5451.218

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SAN FRANCISCO-- Last month, more than 8200 earth scientists gathered here for the fall meeting of the American Geophysical Union. The near-record crowd could choose from sessions on bursts of methane in the ancient ocean, ozone-destroying chlorine in the stratosphere, or a failure of the solar wind on the sun, but more solidly grounded talks included signs of early martian plate tectonics and rocks from the deep mantle.