The Martian (Rock): Evidence of Two Billion Years of Volcanic Activity

02/01/2017 01:00:00 AMThe Martian (Rock): Evidence of Two Billion Years of Volcanic ActivityThe Martian (Rock): Evidence of Two Billion Years of Volcanic Activity

http://www.popularmechanics.com/space/moon-mars/a25023/mars-volcanoes-two-billion-years/

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