Cliff

In geography and geology, a cliff is an area of rock which has a general angle defined by the vertical, or nearly vertical. Cliffs are formed by the processes of weathering and erosion, with the effect of gravity. Cliffs are common on coasts, in mountainous areas, escarpments and along rivers. Cliffs are usually composed of rock that is resistant to weathering and erosion. The sedimentary rocks that are most likely to form cliffs include sandstone, limestone, chalk, and dolomite. Igneous rocks such as granite and basalt also often form cliffs.

An escarpment (or scarp) is a type of cliff formed by the movement of a geologic fault, a landslide, or sometimes by rock slides or falling rocks which change the differential erosion of the rock layers.

Most cliffs have some form of scree slope at their base. In arid areas or under high cliffs, they are generally exposed jumbles of fallen rock. In areas of higher moisture, a soil slope may obscure the talus. Many cliffs also feature tributary waterfalls or rock shelters. Sometimes a cliff peters out at the end of a ridge, with mushroom rocks or other types of rock columns remaining. Coastal erosion may lead to the formation of sea cliffs along a receding coastline.

The Ordnance Survey distinguishes between around most cliffs (continuous line along the topper edge with projections down the face) and outcrops (continuous lines along lower edge).

Etymology

Cliff comes from the Old English word ''clif'' of essentially the same meaning, cognate with Dutch, Low German, and Old Norse ''klif'' 'cliff'. These may in turn all be from a Romance loanword into Primitive Germanic that has its origins in the Latin forms ' ("slope" or "hillside").Monika Buchmüller-Pfaff: ''Namen im Grenzland - Methoden, Aspekte und Zielsetzung in der Erforschung der lothringisch-saarländischen Toponomastik'', Francia 18/1 (1991), Francia-Online: Sex nstitut historique allemand de Paris - Deutsches Historisches Institut Paris
Onlineressource
Max Pfister: ''Altromanische Relikte in der östlichen und südlichen Galloromania, in den rheinischen Mundarten, im Alpenraum und in Oberitalien''. In : Sieglinde Heinz, Ulrich Wandruszka d. ''Fakten und Theorien : Beitr. zur roman. u. allg. Sprachwiss.''; Festschr. für Helmut Stimm zum 65. Geburtstag, Tübingen 1982, pp. 219 – 230,

Large and famous cliffs

Given that a cliff does not need to be exactly vertical, there can be ambiguity about whether a given slope is a cliff or not and also about how much of a certain slope to count as a cliff. For example, given a truly vertical rock wall above a very steep slope, one could count just the rock wall or the combination. Listings of cliffs are thus inherently uncertain.

Some of the largest cliffs on Earth are found underwater. For example, an 8,000 m drop over a 4,250 m span can be found at a ridge sitting inside the Kermadec Trench.

According to some sources, the highest cliff in the world, about 1,340 m high, is the east face of Great Trango in the Karakoram mountains of northern Pakistan. This uses a fairly stringent notion of cliff, as the 1,340 m figure refers to a nearly vertical headwall of two stacked pillars; adding in a very steep approach brings the total drop from the East Face precipice to the nearby Dunge Glacier to nearly 2,000 m.

The location of the world's highest sea cliffs depends also on the definition of 'cliff' that is used. ''Guinness World Records'' states it is Kalaupapa, Hawaii, at 1,010 m high. Another contender is the north face of Mitre Peak, which drops 1,683 m to Milford Sound, New Zealand. These are subject to a less stringent definition, as the average slope of these cliffs at Kaulapapa is about 1.7, corresponding to an angle of 60 degrees, and Mitre Peak is similar. A more vertical drop into the sea can be found at Maujit Qaqarssuasia (also known as the ' Thumbnail') which is situated in the Torssukátak fjord area at the very tip of South Greenland and drops 1,560 m near-vertically.

Considering a truly vertical drop, Mount Thor on Baffin Island in Arctic Canada is often considered the highest at 1370 m (4500 ft) high in total (the top 480 m (1600 ft) is overhanging), and is said to give it the longest vertical drop on Earth at 1,250 m (4,100 ft). However, other cliffs on Baffin Island, such as Polar Sun Spire in the Sam Ford Fjord, or others in remote areas of Greenland may be higher.

The highest cliff in the solar system may be Verona Rupes, an approximately high fault scarp on Miranda, a moon of Uranus.

List

The following is an incomplete list of cliffs of the world.

Africa

Above Sea
*Faneque, Gran Canaria, Spain, 1027 m above Atlantic Ocean
* Anaga's Cliffs, Tenerife, Canary Islands, Spain, above Atlantic Ocean
* Cape Hangklip, Western Cape, South Africa, above False Bay, Atlantic Ocean
* Cape Point, Western Cape, South Africa, above Atlantic Ocean
* Chapman's Peak, Western Cape, South Africa, above Atlantic Ocean
* Karbonkelberg, Cape Town, Western Cape, South Africa, above Hout Bay, Atlantic Ocean
*Los Gigantes, Tenerife, Canary Islands, Spain, above Atlantic Ocean
Above Land
* Innumerable peaks in the Drakensberg mountains of South Africa are considered cliff formations. The Drakensberg Range is regarded, together with Ethiopia's Simien Mountains, as one of the two finest erosional mountain ranges on Earth. Because of their near-unique geological formation, the range has an extraordinarily high percentage of cliff faces making up its length, particularly along the highest portion of the range. This portion of the range is virtually uninterrupted cliff faces, ranging from to in height for almost . Of all, the "Drakensberg Amphitheatre" (mentioned above) is most well known. Other notable cliffs include the Trojan Wall, Cleft Peak, Injisuthi Triplets, Cathedral Peak, Monk's Cowl, Mnweni Buttress, etc. The cliff faces of the Blyde River Canyon, technically still part of the Drakensberg, may be over , with the main face of the Swadini Buttress approximately tall.
** Drakensberg Amphitheatre, South Africa above base, long. The Tugela Falls, the world's second tallest waterfall, falls over the edge of the cliff face.
* Karambony, Madagascar, above base.
* Mount Meru, Tanzania Caldera Cliffs,
* Tsaranoro, Madagascar, above base

America

North

Several big granite faces in the Arctic region vie for the title of 'highest vertical drop on Earth', but reliable measurements are not always available. The possible contenders include (measurements are approximate):

Mount Thor, Baffin Island, Canada; 1,370 m (4,500 ft) total; top 480 m (1600 ft) is overhanging. This is commonly regarded as being the largest vertical drop on Eart

ref name="Buchmüller-Pfaff" />ot:leapyear at 1,250 m (4,100 ft).

# The sheer north face of Polar sun spire, Polar Sun Spire, in the §74:MTAtoFa
of Baffin Island, rises 4,300 ft above the flat frozen fjord, although the lower portion of the face breaks from the vertical wall with a series of ledges and buttresses.
# Ketil's and its neighbor Ulamertorsuaq's west faces in Tasermiut, Greenland have been reported as over 1,000 m high. Another relevant cliff in Greenland is Agdlerussakasit's Thumbnail.

Other notable cliffs include:
* Ättestupan Cliff, northern side of Kaiser Franz Joseph Fjord, Greenland
* Big Sandy Mountain, east face buttress, Wind River Range, Wyoming, 550 m
* Calvert Cliffs along the Chesapeake Bay in Maryland, U.S. 25 m
* Cap Éternité of Saguenay River, Quebec, Canada, 347 m
* All faces of Devils Tower, Wyoming, United States, 195 m
* Doublet Peak, southwest face, Wind River Range, Wyoming, United States, 370 m
* El Capitan, Yosemite Valley, California, United States; 900 m (3,000 ft)
* Grand Teton, north face Teton Range, Wyoming
* Northwest Face of Half Dome, near El Capitan, California, United States; 1,444 m (4,737 ft) total, vertical portion about 610 m (2,000 ft)
* Longs Peak Diamond, Rocky Mountain National Park, Colorado, United States, 400 m
* Mount Asgard, Baffin Island, Canada; vertical drop of about 1,200 m (4,000 ft).
* Mount Siyeh, Glacier National Park (U.S.) north face,
* The North Face of North Twin Peak, Rocky Mountains, Alberta, Canada, 1,200 m
* The west face of Notch Peak in the House Range of southwestern Utah, U.S.; a carbonate rock pure vertical drop of about 670 m (2,200 ft), with from the top of the cliff to valley floor (bottom of the canyon below the notch)
* Painted Wall in Black Canyon of the Gunnison National Park, Colorado, United States; 685 m (2,250 ft)
* Raftsmen's Acropolis, a rock face of the Montagne des Érables, Quebec, Canada, 800 m
* Rockwall, Kootenay National Park, British Columbia, Canada, 30 km of mostly unbroken cliffs up to 900 m
* Royal Gorge cliffs, Colorado, United States, 350 m
* Faces of Shiprock, New Mexico, United States, 400 m
* All walls of the Stawamus Chief, Squamish, British Columbia, Canada, up to 500 m
* Temple Peak, east face, Wind River Range, Wyoming, 400 m
* Temple Peak East, north face, Wind River Range, Wyoming, 450 m
* Toroweap (a.k.a. Tuweep), Grand Canyon, Arizona, United States; 900 m (3,000 ft)
* Uncompahgre Peak, northeast face, San Juan Range, Colorado, 275 m (550 m rise above surrounding plateau)
* East face of the West Temple in Zion National Park, Utah, United States believed to be the tallest sandstone cliff in the world, 670 m

South

* All faces of Auyan Tepui, along with all other Tepuis, Venezuela, Brazil, and Guyana, Auyan Tepui is about 1,000 m (location of Angel Falls) (the falls are 979 m, the highest in the world)
* All faces of Cerro Chalten

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