Desert sand dunes can "sing" as they move.

This phenomenon, known as "singing sand," occurs when certain conditions align to create a unique sound as sand grains slide down the face of a dune. The sound can range from a low, moaning hum to a loud booming noise, often compared to a distant airplane engine. Scientists believe the vibrations of the sand grains rubbing against each other produce the sound. Not all sand dunes can "sing," but those that do create a fascinating auditory experience in the otherwise quiet desert landscape.