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Thought the whole 'singing sand' thing was a myth until I hiked the Kelso Dunes

Heard a low hum under my boots that sounded like a cello, and a park ranger explained the quartz grains have to be perfectly round and dry. Anyone know other spots where this happens reliably?
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young.sarah
Actually the sand doesn't have to be perfectly round, just well sorted. The dryness is the key part. Some beaches in Wales and Scotland can do this too when conditions are right.
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harper_gibson2
I saw a video last year from some geology professor in California who explained that singing sand actually makes a specific frequency around 220 Hz depending on grain size. Apparently the squeak comes from the grains sliding against each other in a really thin layer of air, like a tiny musical instrument. The dryness thing makes total sense because any moisture would mess up that air cushion effect. I think I read somewhere that only about 30 beaches in the whole world reliably do this, which is wild. Makes me want to check out one of those Scottish ones before the weather gets too rough.
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young.sarah
My last attempt at singing sand just sounded like me shuffling through gravel in my driveway. Turns out my timing is as bad as my beach weather luck. I get so excited and stomp around when it's still a bit damp from the morning tide. Patience has never been my strong suit, especially when promised a squeaky beach.
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