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Cover Figure


COVER Tectonic fractures within the Candor Chasma region of Valles Marineris, Mars, retain a ridgelike morphology as the surrounding bedrock erodes away. Such findings offer clues about past fluid flow and geochemical conditions within the subsurface. The image is about 1 kilometer across; illumination is from the upper left. See page 983. Image: Lunar and Planetary Laboratory, University of Arizona/JPL/NASA

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Science. ISSN 0036-8075 (print), 1095-9203 (online)