瀑布（英文：Waterfall），係河流嘅水，遇崖，飛瀉而下，又叫「飛泉」。江、河、涌、澗，都有機有瀑布。响地質學上，瀑布就被叫做「跌水」。佢嘅成因係受到斷層或凹陷等地質構造運動同埋火山噴發等地表變化所造成嘅河流突然中斷，又或者因為流水或冰川對岩石嘅侵蝕同嘅溶蝕所造成河床有地勢差，呢啲都能夠令到河流產生瀑布。
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