The flat floor of the Puyallup River valley near Orting, Washington, is formed by deposits of the 500-year-old Electron lahar, which surged down from Mount Rainier (in background). Lahars, or volcanic mudflows, are rapidly flowing slurries of mud and boulders that destroy or bury most manmade structures in their paths. Lahars from Mount Rainier can travel for tens of miles along river valleys and reach Puget Sound. (USGS photograph by D.E. Wieprecht.)
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