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Where does the sand in a desert come from?

CrowdScience

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Sand in a Desert

Sand collects in a desert because it's filling up natural dips in the landscape called basins. But even after settling in the basin and forming what's known as a sand sea, thanks to the wind, the journey isn't over. Different shapes of dunes will move slightly different to other shapes of dune. So that's one of the projects that I've been working on for some time - how do they move?

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