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单词 Box canyon
释义

Box canyon

英语百科

Canyon

The Grand Canyon, Arizona, at the confluence of the Colorado and Little Colorado rivers
Boğazpınar Canyon, Mersin Province, Turkey
Itaimbezinho Canyon, at Aparados da Serra National Park, Brazil
One of three gorges on Yangtze river, China

A gorge or canyon (cañon, Spanish spelling occasionally still used) is a deep ravine between pairs of escarpments or cliffs and is the most often carved landscape by the erosive activity of a river over geologic timescales. Rivers have a natural tendency to cut through underlying surfaces so will eventually wear away rock layers to lessen their own pitch slowing their waters; given enough time, their bottoms will gradually reach a baseline elevationwhich is the same elevation as the body of water it will eventually drain into. This action, when the river source and mouth are at much different base elevations will form a canyon, particularly through regions where softer rock layers are intermingled with harder layers more resistant to weathering.

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