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Rilles or channels that might have been formed as fiss ures split by the uplifting plateau under tension from heat processes below the Martian crust. The letter "B" or per aps the figure "8" appears to have been etched into the Mars rock at the left edge of this picture taken on July 24 by the Viking I Lander. It is believed to be an illusion caused by weathering processes, and the angle of the sun as it illuminated the patch for the spacecraft camera.