WTF Fun Fact – Singing Sand

“Singing sand” produces a deep hum that can be heard for miles. The sound can be heard as a sand avalanche is triggered by the wind or even by people walking on the sand. There are ~30 sand dunes in the world with the right grain size and dry conditions needed to “sing.” – WTF Fun Facts

Source: Singing Sand Dunes | Nature of Things (cbc.ca)

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