Word: geological
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...regions on earth). The valley is 3½ miles wide and has branching, streamlike tributaries that seem more likely to have been formed by water than by lava. "We are hard put to find a mechanism other than running water for these features," says Harold Masursky of the U.S. Geolog ical Survey. Although scientists agree that there is no free-flowing water on the Martian surface now, the sharp and uneroded features of the valley indicate that it could have been formed in the not-too-distant past-perhaps within the last million years...
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