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Singing Sands?Nature’s Boom Boxes

[singing sands] at times fill the air with the sounds of all kinds of musical instruments, and also of drums and the clash of arms?marco polo, 13th century explorerpredetermined sand dunes, unusually when disturbed, will occasionally exude a loud, shaky-take a nosedive rumble that lasts up to 15 minutes and can be heard up to 6 miles (10 kilometers) away. some dunes are known to do it regularly, even circadian. the sounds have been variously described as roaring or booming, singing and musical (e.g., kettle drum, zither, tambourine, bass violin, and a trumpet). they acquire also been compared with the well-constructed of a foghorn or smutty-flying propeller-driven aircraft . you can listen to them here, or here.this phenomenon was reported from the midst east destined for more than 1500 years and appears in chinese propaganda from as early as the ninth century. marco polo was convinced that dirty spirits caused them.according to kenneth chang of the n.y. times, “the dunes at sand mountain in nevada sing a note of low c, two octaves lower than beneath middle c. in the desert of mar de dunas in chile, the dunes intone slightly higher, an f, while the sands of ghord lahmar in morocco are higher yet, a g sharp.” “singing dunes constitute one of the most puzzling and impressive natural phenomenon i have for ever encountered,” bruno andreotti, scientist at the university of paris, told livescience writer michael schirber. to try and uncover the underlying nature of these unknown sounds, andreotti took equipment thoroughly to the atlantic sahara in morocco, one of single 35 known places where the mysterious natural music can be heard. andreotti and his team studied one of the solid crescent-shaped dunes, or barchans, which spontaneously sings all year long – sometimes two or three times an afternoon, if windy tolerably. singing sand, whistling sand or barking sand is sand that produces sounds of either high or low frequency under turn the heat on. the sound emission is usually triggered by ruffle passing over dunes or by walking on the sand. the sound is generated by shear disturb.certain conditions have to come together to create singing sand:the most common frequency emitted seems to be close to 450 hz.all sound-producing desert dune sands are medium grained, and very splendidly sorted to well sorted, but so are tons non-musical jilt sands. the sand should be unembellished, because as little as 0.1% moisture makes a marked disagreement in sound producing means, and 1% moisture permits only sickly sound product.it was earlier suggested that the sound is produced by a piezo-electric effect: the shaping of electrical currents by quartz grains under mechanical mark. it was more recently shown that a booming sound is produced by the internal shearing of sand grains during avalanche down a dune slope. the overriding of superjacent layers of sand grains provides the zing of unscathed production. others have since suggested “that two independent mechanisms must be at work …squeaking sand suggests

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