Sailing stones
Geological phenomenon where rocks move and inscribe long tracks along a smooth valley floor without human or animal intervention
en-US/ˈseɪlɪŋ ˈstoʊnz/
en-GB/ˈseɪlɪŋ ˈstəʊnz/
Geological phenomenon where rocks move and inscribe long tracks along a smooth valley floor without human or animal intervention