. "EcoLexicon:rockfall"^^ . "rockfall"^^ . "TGN:21504"^^ . "An irregular mass of fallen rock at the base of a cliff or steep slope."^^ . . "FTT:96"^^ . "rockfall"^^ . "ENVO"^^ . "physiographic feature"^^ . "Geonames:T.RKFL"^^ . "Wikipedia:Rockfall"^^ . "FTT:1072"^^ . "ENVO:00000521"^^ .