What makes desert sand sing?

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Hello science fans today we’re talking about singing sand. Some deserts around the world sing.Do you know what causes the humming or singing?

If you guess sand, you’re right.

As sand grains move down the slopes of dunes it produces a deep, groaning hum that reverberates for miles. But why do the notes differ from dune to dune?

Three French biophysicists say it’s not the ‘motion in the desert ocean’ it’s the size of the sand that matters.

It turns out sand of a certain size tends to produce notes around 90 Hertz; the same range as a cello, bass clarinet or bassoon. When wind or other factors like people cause the sand to move, it produces a variety of hums.

Weird, huh?!