DR JUERG ALEAN / SCIENCE PHOTO LIBRARY DR JUERG ALEAN / SCIENCE PHOTO LIBRARY
Sand ripples and ice on tidal flat. Ripples in the sand interspersed with ice on a tidal flat in the Arctic. During a cold night, brackish seawater froze between the ripples. The ripples are a result of gentle wave action when the sand was submerged at high tide. Photographed near Tromso, northern Norway.
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