Avalanching sand from dune faces can trigger loud, rumbling 'booming' or short bursts of 'burping' sounds -- behaving as a perfectly tuned musical instrument. This sound is persistent and the dunes 'sing' in frequencies ranging from 70 to 105 Hertz, with higher harmonics. Researchers discovered that the 'booming' and 'burping' correspond to the transmission of a class of different waves within the dune.
from Strange & Offbeat News -- ScienceDaily http://ift.tt/1KDapW2
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