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8 December 2004 Yardangs are ridges formed by wind erosion. Most commonly, they will form in sedimentary rocks or volcanic ash deposits containing some amount of sand-sized grains (particles of 0.0625 to 2.0 millimeters size, like the grains in common table salt). This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a suite of yardangs in the Memnonia Sulci region. The scene is located near 9.3S, 172.4W, and covers an area about 3 km (1.9 mi) wide. The ridges are illuminated by sunlight from the upper left.

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      EUN,LOM,LRE4,hdl:10494/254752,work-cmr-id:254752,http://photojournal.jpl.nasa.gov:http://photojournal.jpl.nasa.gov/catalog/PIA07123,ilox,learning resource exchange,LRE metadata application profile,LRE

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