Far from the blaring cacophony of cities, towns and suburbs, there are far quieter soundtracks to be found -- the murmurs of wind rustling grasses, rushing waves tumbling onto beaches, the creaking of tree branches and trunks.
But underneath all that is yet another soundscape, a permanent, low-frequency drone produced by Earth itself, from the vibrations of ongoing, subtle seismic movements that are not earthquakes and are too small to be detected without special equipment.
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