Details of hilly terrain within a large Martian canyon are shown on a geological map based on observations from NASA's Mars Reconnaissance Orbiter and produced by the U.S. Geological Survey; notations explained in the legend with the full map at http://pubs.usgs.gov/sim/3309/
Credit: NASA/JPL-Caltech/Univ. of Arizona/USGS
Long ago, in the largest canyon system in our solar system, vibrations from "marsquakes" shook soft sediments that had accumulated in Martian lakes.
From Jet Propulsion Laboratory/NASA
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