Martian Clays Tell Story of a Wet Past

Layers of clay-rich rock Layers of clay-rich rock.

August 07, 2008

Layers of clay-rich rock at a potential landing site for future Mars rovers suggest a long-term history of liquid water activity, possibly including hot water, at the now-dry site.

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http://www.seti.org/news/press-releases/martian-clays.php