Canyons Wallpapers

Canyons - photo wallpapers; megawallpapers.com: A canyon, or gorge, is a valley walled by cliffs. 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 (canon). 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. In the southwestern United States, canyons are important archeologically because of the many cliff-dwellings built there, largely by the Ancient Pueblo Peoples. Sometimes large rivers run through canyons as the result of gradual geologic uplift. These are called entrenched rivers, because they are unable to easily alter course. The Colorado River and the Snake River in the northwestern United States are two examples of this. Canyons often form in areas of limestone rock. Limestone is to a certain extent soluble, so cave systems form in the rock. When these collapse a canyon is left, for example in the Mendip Hills in Somerset and Yorkshire Moors in Yorkshire, England.

This site contains a large collection of celebrity wallpapers, movie wallpaper, animal wallpaper (Desktop Wallpapers) for your computer desktop.The terms wallpaper and desktop picture refer to an image used as a background on a computer screen, usually for the desktop of a graphical user interface. Wallpaper is the term used in Microsoft Windows, while the Mac OS calls it a desktop picture (prior to Mac OS X, the term desktop pattern was used to refer to a small pattern that was repeated to fill the screen).Typical categories can include cars, models celebrities, scenery, abstract art, movies, pets, family, symmetry, and the users own photos.