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A waterfall is a body of water that rushes down a steep ledge. The water flows from higher land, then it falls down a big step of rock to lower land where it will continue on its journey. Waterfalls are usually made when a river is young.
- Carreck, Rosalind, ed (1982). The Family Encyclopedia of Natural History. The Hamlyn Publishing Group. pp. 246–248. ISBN 0711-20225-7.
- "Angel, Salto". www.world-waterfalls.com. http://www.world-waterfalls.com/waterfall.php?num=1/. Retrieved 2009-02-25.