DR. MARLI MILLER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY DR. MARLI MILLER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY
Sand flows on the steep face of a coastal sand dune, with some consisting of multiple deposits, Oregon, USA. These flows are driven by gravity (mass wasting) and exhibit the same morphology as debris flows and mudflows.
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