A piece of Mars: Some places on Mars highlight just how effective the wind is at sculpting the surface. This is a good example. Dark and light stripes on the right show not one but two successive influxes of sand: the light dunes formed first, then were eroded, and finally dark sand invaded the area. Some of it got stuck in the troughs between the older dunes. Bright streaks behind craters show that the dark sand blew in from the west-southwest. (HiRISE ESP_028603_1765)

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