This view, recorded on January 1 by the orbiting Mars Global Surveyor shows a small portion of Valles Marineris in amazing detail. The image is about 6 miles wide and high resolution versions show features as small as 20 feet across. In the Grand Canyon on planet Earth , sedimentary processes have resulted in spectacular rock layers. But similar layers of rock in canyons of the Hawaiian Islands were created by volcanoes . Regardless of the origin of layering on Mars , its extent suggests that early Mars was geologically active and complex.
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