Tomorrow is "World Listening Day"! Have you ever listened to the Great Sand Dunes? Listen now in this 10 second clip! The sand makes a deep "singing" sound as the sand grains avalanche down the face of a dune. Scientists believe that the sound is generated by the millions of sand grains rubbing together as air moves through them - similar to our vocal chords. In the 1940s, one of Bing Crosby's hit songs was "The Singing Sands of Alamosa", referring to this unique phenomenon. | Great Sand Dunes N

#ScienceSaturday - Have you ever heard sand sing? Listen to 15 seconds of this bizarre phenomenon! Just as our own voices are made by air moving through vibrating vocal chords, a humming sound is made at Great Sand Dunes as air is pushed through millions of tumbling sand grains during an avalanche. Avalanches occur naturally during storms, but can also be created by people pushing sand down a dune face. In the 1940s, one of Bing Crosby's musical hits was "The Singing Sands of Alamosa" - a love s

341K views · 1.5K shares | Turn up the bass on this one. Nature turned this sand dune into a giant speaker cone. | AJ+ | Facebook