granular media
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These Are Bubbles Made Of Sand
Engineers observed bubbles of sand moving within other sand, like oil droplets through water, in a first-of-its-kind observation.
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This Is Why Some Sand Dunes Sing
Certain sand dunes make their own desert music, singing, booming, or even “burping” — a naturally occurring musical instrument. Scientists have discovered that these distinct sounds are each created by different types of waves moving through the dunes.