Mystery Strange Sounds from Sand Dunes solved
Strange Sounds from sand dunes have been recorded over centuries but remained an unexplained mystery. They are similar to a low-flying propeller plane or the deep humming of an electric wire and are very similar to the Strange Sounds in the sky. Researchers determined that these weird noises were emitted when the sand on the surface is disturbed. The friction between sand grains of a certain size would create a noise that reverberates back and forth between dry sand on the surface and wet sand below at around 90 Hz (low cello, bass clarinet). Researchers also found that the sound continues after the movement has stopped and has different sonorities in winter and in summer.