Mars, sand dunes, North Polar erg, basalt, gypsum, crescent shape, polygonal patterns, continuous dunes, HiRISE, University of Arizona, geology

Mars, sand dunes, North Polar erg, basalt, gypsum, crescent shape, polygonal patterns, continuous dunes, HiRISE, University of Arizona, geology
Mars, sand dunes, North Polar erg, basalt, gypsum, crescent shape, polygonal patterns, continuous dunes, HiRISE, University of Arizona, geology
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