How sand forms on Mars

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PSP_003684_1730_0.5xA piece of Mars: All that sand on Mars — where does it come from? It’s often hard to figure that out. Here is a rare case where we can see material shedding from a stack of bright layered rocks, moving downslope (toward the top of the frame). (PSP_003684_1730, NASA/JPL/Univ. of Arizona)

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