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Canyon

{{short description|Deep chasm between cliffs}}

{{redirect2|Gorge|Cañon|other uses|Canyon (disambiguation)|and|Gorge (disambiguation)|and|Canon (disambiguation)}}

File:Aerial view of canyons.jpg, Arizona, at the confluence of the Colorado River and Little Colorado River.]]

A canyon (from {{Langx|es|cañón}}; archaic British English spelling: cañon),{{Cite encyclopedia |url=http://www.lexico.com/definition/canon |archive-url=https://web.archive.org/web/20200116100856/https://www.lexico.com/definition/canon |url-status=dead |archive-date=January 16, 2020 |title=canon |dictionary=Lexico UK English Dictionary |publisher=Oxford University Press}} gorge or chasm, is a deep cleft between escarpments or cliffs resulting from weathering and the erosive activity of a river over geologic time scales.{{cite web|title= canyon|url=https://www.nationalgeographic.org/encyclopedia/canyon/|publisher=National Geographic Society|language=en|date=20 May 2011}} Rivers have a natural tendency to cut through underlying surfaces, eventually wearing away rock layers as sediments are removed downstream. A river bed will gradually reach a baseline elevation, which is the same elevation as the body of water into which the river drains. The processes of weathering and erosion will form canyons when the river's headwaters and estuary are at significantly different elevations,{{cite web|url=http://www.mountainnature.com/Geology/Canyons.htm|title=Understanding Canyon Formation|author=Ward Cameron|date=2005|access-date=2010-10-07|archive-date=2001-04-25|archive-url=https://web.archive.org/web/20010425195318/http://www.mountainnature.com/Geology/Canyons.htm|url-status=dead}} particularly through regions where softer rock layers are intermingled with harder layers more resistant to weathering.

A canyon may also refer to a rift between two mountain peaks, such as those in ranges including the Rocky Mountains, the Alps, the Himalayas or the Andes. Usually, a river or stream carves out such splits between mountains. Examples of mountain-type canyons are Provo Canyon in Utah or Yosemite Valley in California's Sierra Nevada. Canyons within mountains, or gorges that have an opening on only one side, are called box canyons. Slot canyons are very narrow canyons that often have smooth walls.

Steep-sided valleys in the seabed of the continental slope are referred to as submarine canyons. Unlike canyons on land, submarine canyons are thought to be formed by turbidity currents and landslides.

Etymology

File:Canyon sumidero entrada.jpg, Mexico]]

The word canyon is Spanish in origin ({{Lang|es|cañón}},{{cite EB1911 |wstitle=Canyon}} {{IPA|es|kaˈɲon|pron}}), with the same meaning. The word canyon is generally used in North America, while the words gorge and ravine (French in origin) are used in Europe and Oceania, though gorge and ravine are also used in some parts of North America. In the United States, place names generally use canyon in the southwest (due to their proximity to Spanish-speaking Mexico) and gorge in the northeast (which is closer to French Canada), with the rest of the country graduating between these two according to geography. In Canada, a gorge is usually narrow while a ravine is more open and often wooded. The military-derived word defile is occasionally used in the United Kingdom. In South Africa, kloof (in Krantzkloof Nature Reserve) is used along with canyon (as in Blyde River Canyon) and gorge (in Oribi Gorge).{{Cite web |title=kloof – definition of kloof in A Dictionary of South African English – DSAE |url=https://dsae.co.za/entry/kloof/e03913 |access-date=2024-08-06 |website=dsae.co.za}}

Formation

File:Kevo Canyon.JPG, Finland]]

Most canyons were formed by a process of long-time erosion from a plateau or table-land level. 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 wet areas because physical weathering has a more localized effect in arid zones. The wind and water from the river combine to erode and cut away less resistant materials such as shales. The freezing and expansion of water also serves to help form canyons. Water seeps into cracks between the rocks and freezes, pushing the rocks apart and eventually causing large chunks to break off the canyon walls, in a process known as frost wedging.

{{cite web

|url=http://www.bobspixels.com/kaibab.org/geology/gc_geol.htm

|title=The Geology of the Grand Canyon

|access-date=2015-10-01

}} Canyon walls are often formed of resistant sandstones or granite.

File:Snake River Canyon Idaho 2007.jpg, Idaho]]

Sometimes large rivers run through canyons as the result of gradual geological uplift. These are called entrenched rivers, because they are unable to easily alter their course. In the United States, the Colorado River in the Southwest and the Snake River in the Northwest are two examples of tectonic uplift.

Canyons often form in areas of limestone rock. As limestone is soluble to a certain extent, cave systems form in the rock. When a cave system collapses, a canyon is left, as in the Mendip Hills in Somerset and Yorkshire Dales in Yorkshire, England.

=Box canyon=

{{For|the Colorado canyon|Box Canyon, Colorado}}

A box canyon is a small canyon that is generally shorter and narrower than a river canyon, with steep walls on three sides, allowing access and egress only through the mouth of the canyon. Box canyons were frequently used in the western United States as convenient corrals, with their entrances fenced.{{cite web |url=http://encarta.msn.com/dictionary_1861686591/box_canyon.html |title=box canyon |date=2009 |publisher=Encarta World English Dictionary |access-date=2009-08-04 |archive-url=https://web.archive.org/web/20091217053643/http://encarta.msn.com/dictionary_1861686591/box_canyon.html |archive-date=2009-12-17 |url-status=dead }}

Largest

The definition of "largest canyon" is imprecise, because a canyon can be large by its depth, its length, or the total area of the canyon system. Also, the inaccessibility of the major canyons in the Himalaya contributes to their not being regarded as candidates for the biggest canyon. The definition of "deepest canyon" is similarly imprecise, especially if one includes mountain canyons, as well as canyons cut through relatively flat plateaus (which have a somewhat well-defined rim elevation).

The Yarlung Tsangpo Grand Canyon (or Tsangpo Canyon), along the Yarlung Tsangpo River in Tibet, China, is regarded by some as the deepest canyon on Earth at {{Convert|5500|m}}. It is slightly longer than Grand Canyon in the United States.{{cite web|url=http://www.kepu.net.cn/english/canyon/hiking/hik301.html|title=China Virtual Museums: Canyon|website=Kepu.net}} Others consider the Kali Gandaki Gorge in midwest Nepal to be the deepest canyon, with a {{Convert|6400|m|adj=on}} difference between the level of the river and the peaks surrounding it.{{citation needed|date=August 2024}}

Vying for the deepest canyon in the Americas is the Cotahuasi Canyon and Colca Canyon, in southern Peru. Both have been measured at over {{Convert|3500|m}} deep.

Grand Canyon of northern Arizona in the United States, with an average depth of {{Convert|1600|m}} and a volume of {{Convert|4.17|e12m3|abbr=off}},{{cite web|url=http://www.nps.gov/grca/parkmgmt/statistics.htm|title=Park Statistics|website=National Park Service|location=USA}} is one of the world's largest canyons. It was among the 28 finalists of the New 7 Wonders of Nature worldwide poll. (Some referred to it as one of the seven natural wonders of the world.){{cite web|last=Truong|first=Alice|title=Everything About the Grand Canyon|url=http://dsc.discovery.com/adventure/everything-about-the-grand-canyon.html|publisher=Discovery Communications|access-date=5 February 2012|date=1 July 2011}}

The largest canyon in Europe is Tara River Canyon.

The largest canyon in Africa is the Fish River Canyon in Namibia.{{cite book|author=Cohen, Callan|author2=Spottiswoode, Claire|author3=Rossouw, Jonathan|name-list-style=amp |date=2006|title=Southern African Birdfinder|isbn= 978-1-86872-725-4|page= 210|publisher=Penguin Random House South Africa }}

In August 2013, the discovery of Greenland's Grand Canyon was reported, based on the analysis of data from Operation IceBridge. It is located under an ice sheet. At {{Convert|750|km}} long, it is believed to be the longest canyon in the world.{{cite web|url=http://news.discovery.com/earth/rocks-fossils/greenland-longest-canyon-discovered-130830.htm|title=Grand Canyon of Greenland Discovered under Ice|website=news.discovery.com|date=2017-05-10|access-date=2013-08-30|archive-date=2016-05-11|archive-url=https://web.archive.org/web/20160511221221/http://news.discovery.com/earth/rocks-fossils/greenland-longest-canyon-discovered-130830.htm|url-status=dead}}

Despite not being quite as deep or long as Grand Canyon, the Capertee Valley in Australia is actually 1 km wider than Grand Canyon, making it the widest canyon in the world.{{cite news|url=http://www.dailytelegraph.com.au/lifestyle/parenting/school-holidays/forget-the-grand-canyon-the-second-biggest-geological-marvel-in-the-world-is-right-here-in-nsw/news-story/3b0b48ac4d7a5cd323dd4b6590266fd8 |title=Capertee Valley: Australia's own Grand Canyon |newspaper=The Daily Telegraph |date=14 December 2015 |author=Fitzsimons, David |access-date= March 28, 2016}}{{cite web |url=http://www.abc.net.au/science/articles/2012/05/22/3507609.htm |title=Grand Canyon is not so grand › Dr Karl's Great Moments in Science |website=ABC Science|date=22 May 2012 |author=Kruszelnicki, Karl S. |access-date= March 28, 2016}}

{{wide image|Capertee Valley panorama.jpg|900|Panoramic view of the Capertee Valley in Australia, the widest largest canyon in the world}}

Cultural significance

Some canyons have notable cultural significance. Evidence of archaic humans has been discovered in Africa's Olduvai Gorge. In the southwestern United States, canyons are important archeologically because of the many cliff-dwellings built in such areas, largely by the ancient Pueblo people who were their first inhabitants.

Notable examples

{{For|a complete list|List of canyons}}The following list contains only the most notable canyons of the world, grouped by region.

= Africa =

File:Fish River Canyon from Main View Point.jpg, Namibia]]

==Namibia==

{{Multiimage

| image1 = Blyde River Canyon Panorama 2013.jpg

| image2 = Oribi Gorge, South Africa.jpg

| direction = vertical

| caption1 = Blyde River Canyon, South Africa

| caption2 = Oribi Gorge, Kwa-Zulu Natal

}}

==South Africa==

==Tanzania==

=Americas=

==Argentina==

==Brazil==

==Bolivia==

File:Ouimet Canyon Provincial Park - Canyon-Thunder Bay- Ontario (2).jpg, Ontario, Canada]]

==Canada==

==Colombia==

==Mexico==

==Peru==

==United States==

=Asia=

File:Sunset on the Yangtze River.jpg of the Yangtze River, China]]

File:Kabul River gorge -a.jpg in Afghanistan]]

File:Canyon, north eastern Kurdistan.jpg

==China==

==India==

==Indonesia==

==Others==

=Europe=

File:Cheddar Gorge, Somerset, UK - Diliff.jpg, England]]

File:Le cirque de la Madeleine 2011.jpg, Gorges de l'Ardèche, France]]

File:Arribes del Duero - Miranda edited.jpg gorge on the Portugal–Spain border]]

==United Kingdom==

==France==

==Ukraine==

File:Buky Canyon, Ukraine.jpg, Ukraine]]

==Others==

File:Lazar's canyon.jpg, Serbia]]

File:Jamison valley frm wentworth falls.jpg, Blue Mountains National Park, Australia]]

File:Block-up Gorge, Shoalhaven River - panoramio.jpg

=Oceania=

==Australia==

==New Zealand==

=Solar System=

  • Ithaca Chasma on Saturn's moon Tethys
  • Valles Marineris on Mars, the largest-known canyon in the Solar System
  • Vid Flumina on Saturn's largest moon Titan is the only known liquid-floored canyon in the Solar System besides Earth{{cite journal|first1= Valerio|last1= Poggiali|first2= Marco|last2= Mastrogiuseppe|first3= Alexander G.|last3= Hayes|first4= Roberto |last4=Seu|first5= Samuel P. D.|last5= Birch|first6= Ralph|last6= Lorenz|first7= Cyril|last7= Grima|first8= Jason D.|last8= Hofgartner|title =Liquid-filled Canyons on Titan|date= 9 August 2016|url = http://onlinelibrary.wiley.com/doi/10.1002/2016GL069679/abstract|journal = Geophysical Research Letters|volume =43|issue = 15 |pages = 7887–7894|doi = 10.1002/2016GL069679|bibcode= 2016GeoRL..43.7887P|hdl= 11573/932488|s2cid= 132445293|hdl-access= free}}
  • Messina Chasmata on Uranus' moon Titania

Venus has many craters and canyons on its surface. The troughs on the planet are part of a system of canyons that is more than 6,400 km long.

See also

{{portal|Earth sciences|Environment|Geology}}

{{Div col|small=no}}

  • {{annotated link|Antecedent drainage stream}}
  • {{annotated link|Canyoning}}
  • {{annotated link|Chine}}
  • {{annotated link|Draw (terrain)}}
  • {{annotated link|Geomorphology}}
  • {{annotated link|Gully}}
  • {{annotated link|Sinkhole}}
  • {{annotated link|Steephead valley}}
  • {{annotated link|Valley}}

{{Div col end}}

References

{{reflist}}

External links

{{wiktionary}}

  • {{Wikivoyage inline|Canyons and gorges}}
  • {{commons category-inline|Canyons}}

{{river morphology}}

{{Rivers, streams and springs}}

{{Authority control}}

Category:Slope landforms

Category:Landscape