When a wind or water current flows across loose sand, the sand is dragged along the bottom and frequently is piled up to form ripples and dunes. https://sites.pitt.edu/~cejones/GeoImages/5SedimentaryRocks/SedStructures/Ripples.html
Gulf Coast sand is softer and finer than you see on most other beaches around the world. That’s the result of pure, white quartz crystal that washed down from the Appalachian Mountains and was deposited in the Gulf of Mexico. https://cleanisland.org/alabama-gulf-coast-sand-soft-white/
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