The way this sand falls from a dune in the desert, models a geologic pattern called retrogressive landslide. This video of a retrogressive slide that happened in 1978 in Rissa, Norway explains how it happens [https://t.co/cfHlSPK4jr] [gif: https://t.co/ztmXwRK1TD] pic.twitter.com/NJxjUZHWaN
— Massimo (@Rainmaker1973) September 13, 2020
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