1.a relatively flat highland
PlateauPla*teau" (?), n.; pl. F. Plateaux (F. �; E. �), E. Plateaus (#). [F., fr. OF. platel, properly a little plate. See Plate.]
1. A flat surface; especially, a broad, level, elevated area of land; a table-land.
2. An ornamental dish for the table; a tray or salver.
definition of Wikipedia
chose dont seule la surface est plate (fr)[ClasseParExt.]
élément du relief montagneux (fr)[DomainDescrip.]
élément du relief géographique (fr)[DomainDescrip.]
elevation, natural elevation[Hyper.]
upland; highland; shelf; tableland; plateau[ClasseHyper.]
élément du relief montagneux (fr)[DomainDescrip.]
||This article needs additional citations for verification. (June 2010)|
Plateaus can be formed by a number of processes, including upwelling of volcanic magma, extrusion of lava, and erosion by water and glaciers. Magma rises from the mantle causing the ground to swell upward, in this way large, flat areas of rock are uplifted. Plateaus can also be built up by lava spreading outward from cracks and weak areas in the crust. Plateaus can also be formed by the erosional processes of glaciers on mountain ranges, leaving them sitting between the mountain ranges. Water can also erode mountains and other landforms down into plateaus.
Plateaus are classified according to their surrounding environment.
The largest and highest plateau in the world is the Tibetan Plateau, called the "roof of the world", which is still being formed by the collisions of the Indo-Australian and Eurasian tectonic plates. In all, the Tibetan plateau covers an area of some 2.5 million square kilometres, approximately 5000 m above sea level. The height of this plateau is such that it is enough to reverse the Hadley cell convection cycles and to drive the monsoons of India towards the south.
The second-largest current plateau in the world is the Antarctic Plateau, which covers most of the central part of Antarctica. In that region of Antarctica, there are no known mountains, but rather 3000 meters or more of ice - which very slowly spreads toward the coastline via enormous glaciers. This ice cap is so massive that echo location sound measurements of the thickness of the ice have shown that large parts of the "dry land" surface of Antarctica have been pressed below sea level. Thus, if the icecap were somehow removed, large areas of Antarctica would be flooded by the oceans. On the other hand - more realistically - were the icecap to gradually melt away, the surface of the land beneath it would gradually rebound away from the center of the Earth, and that land would ultimately rise above sea level.
The third-largest plateau in the world is probably the one in South America that lies in the middle of the Andes Mountains. This Andean Plateau covers most of Bolivia, central Ecuador, central Peru, northern Chile and northern Argentina.
The Colorado Plateau in northern Arizona and southern Utah is bisected by the valley of the Colorado River and the Grand Canyon. How this came to be is that over 10 million years ago, a river was already there, though not necessarily on exactly the same course. Then, subterranean geological forces caused the land in that part of North America to gradually rise by about a centimeter per year for millions of years. An unusual balance occurred: the river that would become the Colorado River was able to erode into the crust of the Earth at a nearly equal rate to the uplift of the plateau. Now, millions of years later, the North Rim of the Grand Canyon is at an elevation of about 2450 meters (9800 ft) above sea level, and the South Rim of the Grand Canyon is about 2150 meters (8200 ft) above sea level. At its deepest, the Colorado River is about 1830 meters (6000 ft) below the level of the North Rim.
The southern edge of the plateau in northern Arizona is called the Mogollon Rim, where the elevation of the land declines steeply into central Arizona. This Mogollon Rim is located about 20 kilometers south Flagstaff, Holbrook, Winslow, and Williams, Arizona. Because of the snowy plateau and the San Francisco Mountains to its north, the Mogollon Rim area is noted for its many natural springs and artesian wells.
|Wikimedia Commons has media related to: Plateaus|
Dictionary and translator for handheld
New : sensagent is now available on your handheld
A windows (pop-into) of information (full-content of Sensagent) triggered by double-clicking any word on your webpage. Give contextual explanation and translation from your sites !
With a SensagentBox, visitors to your site can access reliable information on over 5 million pages provided by Sensagent.com. Choose the design that fits your site.
Improve your site content
Add new content to your site from Sensagent by XML.
Crawl products or adds
Get XML access to reach the best products.
Index images and define metadata
Get XML access to fix the meaning of your metadata.
Please, email us to describe your idea.
Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !
Change the target language to find translations.
Tips: browse the semantic fields (see From ideas to words) in two languages to learn more.