Sounds natural

I report an interesting post by [klang~440]:

Another place for listening to gravity is the desert: in some deserts and dunes, there’s a phenomenon called ‘booming sands’. Due to the special characteristics of some kinds of sand (extremely round shape, well polished and covered with certain minerals), it makes sounds, ranging from squeaking when you walk on it to actual low frequency booming when the sand is shifted by gravity. There’s a wonderful movie on Youtube:

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