The Singing Sands
Jonas Satkauskas / Wikipedia, Tiny Fox Lab

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 shearing sand away with their hands and feet. There are approximately 30 dunes around the world that have the right grain size and dry conditions, each with its own distinctive pitch.Tiny Fox Lab Facts

Preview photo credit: Jonas Satkauskas / Wikipedia
Source: https://www.cbc.ca/natureofthings/features/singing-sand-dunes