FACTOID # 29: 73.3% of America's gross operating surplus in motion picture and sound recording industries comes from California.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Canyons
Enlarge
Grand Canyon, Arizona

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.


The word canyon is Spanish in origin (cañón). 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.


Two canyons usually attributed as the world's largest are the:

However, this definition used are rather inprecise, as a canyon can be "large" by its depth, length, or the total area of the canyon system. Also the inaccessibility of the major canyons in the Himalaya contributes to the fact that they are not often known or regarded as candidates for the biggest canyon. The deepest canyon in the world, Yarlung Tsangpo Canyon, along the Brahmaputra in Tibet, China even slightly longer than Grand Canyon, is also regarded by many as be the world's largest canyon, followed by the Kali Gandaki Canyon in Nepal, and Polung Tsangpo Canyon in Tibet.


Other well-known canyon systems include:

Other lesser-known canyon systems include:

Other canyons in the Himalayas include:

The Blue Mountains west of Sydney in New South Wales, Australia contain many canyons carved into the sandstone rock.


See also: List of Canyons, list of landforms, geomorphology, geology, earth science, canyoning.




  Results from FactBites:
 
Encyclopedia4U - Grand Canyon - Encyclopedia Article (369 words)
The Grand Canyon is a colorful, steep-sided gorge, carved by the Colorado River, in northern Arizona.
The canyon, considered to be among the major natural wonders of the world, is largely contained in the Grand Canyon National Park - one of the first national parks in the United States.
The canyon was first seen by a European in 1540, García López de Cárdenas from Spain.
Canyon - Wikipedia, the free encyclopedia (342 words)
A canyon or gorge is a deep valley often carved from the Earth by a river.
Canyons are much more common in arid areas than in wetter areas because weathering has a lesser effect in arid zones.
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.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m