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A waterfall is a place where water rushes down a steep ledge. The water flows from higher land, then it falls down a big step of rock to lower land of softer rock where it will continue on its journey. Usually the lower land is in a gorge. Waterfalls are usually made when a river is young, in places where softer rock is underneath harder rock| in the waterfalls
- Carreck, Rosalind, ed (1982). The Family Encyclopedia of Natural History. The Hamlyn Publishing Group. pp. 246–248. .
- "World Waterfall Database: World's Tallest Waterfalls". www.world-waterfalls.com. http://www.world-waterfalls.com/waterfall.php?num=1/. Retrieved 2009-02-25.