2. You Can Hear Sand Moan and Trees Click (If You’re Standing in the Right Place)
Back in the 1960s, a Scottish researcher John Milburn recorded the sound of trees. Where does the sound come from? It makes noises when trees struggle to get water, mainly in drought. They also make ultrasonic sounds. Three Parisian scientists tried to track this case in Morocco and Oman. They triggered a sand avalanche that registered a low G-sharp (or 105 Hz) on one hill and a nine note cacophony (ranging from 90 to 150 Hz) on the other. They then researched on grains of Moroccan sand, which were almost all the same size, made one distinct sound while on the other hand the sand grains from the Oman ranged in size and, therefore, made different sounds.