Valles Marineris is a wide, deep network of chasms stretching for some 2500 miles on the surface of Mars. How do we believe such a big set of canyons formed originally?1) it was caused by tectonic pressures from deep within the planet2) it was produced suddenly by flooding water some four billion years ago3) it was scoured out of the Martian sands by the action of the regular dust storms4) it was made by hundreds of impacts from space billions of years ago5) the canyons were places the Martians used for drag racing, but they moved away

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