Canyon

A canyon, or gorge, is a valley walled by cliffs. In fortification a gorge is the rear entrance or part of a bastion or similar outwork.

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Most canyons originate by a process of long-time erosion from a plateau level, with a stream gradually carving out its valley. The cliffs form because harder rock strata that are resistant to erosion and weathering remain exposed on the valley walls. Canyons are much more common in arid areas than in wetter areas because weathering has a lesser effect in arid zones. Canyons' walls are often formed of resistant sandstones or granite. Submarine canyons are those which form underwater, generally at the mouths of rivers. The word canyon is Spanish in origin (ca??n). The word Canyon is generally used in the United States, while the word Gorge is more common in Europe and Australasia, though it is also used in some parts of the United States and Canada.

Valley: :This article is about the physical-geographic term. For places named "Valley" see Valley (disambiguation)....

Cliff: In geography, a cliff is a significant vertical, or near vertical, rock exposure. Cliffs are categorized as erosion landforms due to the processes of erosion and weathering that produce them. Cliffs are common on coasts, in mountainous areas, escarpments, and along rivers. Generally speaking, cli...

Fortification: Fortifications are military constructions and buildings designed for defense in warfare. Humans have constructed defensive works for many thousands of years, in a variety of increasingly complex designs. The term is derived from the Latin fortis ("strong") and facere ("to make")....

Canyon related Images and Photos (experimental)

Canyon II	Canyon Wall: Shadow	Canyon River (DVD)	Canyon Stream
Canyon Mustangs	Canyon de Chelly	Canyon Near Ojai	Canyon River (On Demand)
Bryce Canyon	Grand Canyon	Grand Canyon	Spring Canyon