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Wikipedia definition
1. RockfallRockfall or rock-fall refers to quantities of rock falling freely from a cliff face. A rockfall is a fragment of rock (a block) detached by sliding, toppling, or falling, that falls along a vertical or sub-vertical cliff, proceeds down slope by bouncing and flying along ballistic trajectories or by rolling on talus or debris slopes,” (Varnes, 1978).
Read “Rockfall” on English Wikipedia
Read “がけ崩れ” on Japanese Wikipedia
Read “Rockfall” on DBpedia

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