When there is a vertical hard rock along the river channel continuous waterfalls are formed referred to as rapids.
When a river flows over a fault scarp, the river channel falls into the faulted valley through a waterfall.
When a river plunges from into a coastal plain from a plateau.
When river rejuvenation occurs along a river channel, waterfalls occur at the knick points.
When a river channel flows over underlying volcanic dykes,lava dams or plugs, a waterfall is formed at the point of overflow.
Faimus answered the question on January 3, 2018 at 20:01
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