by ibimec in
A canyon is a narrow valley with steep rock walls between hills or mountains There are three main types of canyons: slot canyons, box canyons, and underwater canyons. A slot canyon is a narrow canyon with smooth walls, box canyons are only open on one side, while underwater canyons are formed due to landslides and turbidity currents and not by weather or erosion. A gorge is a deep channel formed by a river that has eroded the Earth`s crust for millions of years. Some gorges are so large that they are visible from space. One of the most famous is the Grand Canyon. Answer: A gorge is an I-shaped, narrow and deep valley formed by a river when it erodes rocks vertically. Gorges can be found all over the world. The largest U.S. canyons include the Grand Canyon, finger Lake Gorge, Columbia River Gorge, New River Gorge, and Canyon Lake Gorge. China`s gorges include the three gorges of the Yangtze River, the Grand Canyon of Yarlung Zangbo and the Gorges of Kali Gandaki. Victoria Falls Gorge and Olduvai Gorge are located in Africa; The Gorges de Verdun are located in Europe. A gorge is a deep, narrow valley with very steep sides, usually where a river flows through mountains or an area of hard rock. .
the deep gorge between these hills. The term comes from the French word throat, which means neck or neck. A canyon is often smaller than a canyon, although both words are used to describe deep, narrow valleys with a stream or river flowing along its bottom. A number of natural forces form gorges. The most common is erosion by streams or rivers. A gorge can also form when an earthquake causes a geological uplift. This increase causes parts of the Earth`s surface to be higher than the environment. As rivers flow over these elevated areas, waterfalls form. In the meantime, there is erosion of softer rock layers, which leads to the collapse of a river bed that forms a gorge. For example, the Macocha Gorge in the Czech Republic was created by the erosion of the Punkva River, which led to the collapse of an underground cave.
Gorges can also be formed by glaciers that are exposed when a glacier melts. A gorge is a narrow valley with steep rock walls between hills or mountains. The term comes from the French word throat, which means neck or neck. A canyon is often smaller than a canyon, although both words are used to describe deep, narrow valleys with a stream or river flowing along its bottom. A number of natural forces form gorges. The most common is erosion by streams or rivers. Streams dig through layers of hard rock, break them or erode them. Sediment from the used rock is then transported downstream. Over time, this erosion will form the steep walls of a gorge.
Flooding streams or rivers increases the speed and intensity of this erosion, creating deeper and wider gorges. The deep Talari Gorge in Mali, for example, was formed by the Sngal River, which flows into the Atlantic Ocean on the west coast of Africa. Geological uplifts also form gorges. Geological uplift is the upward movement of the Earth`s surface. Geological uplifts are often associated with earthquakes and orogeny, the process of mountain formation. During geological uplift, the rock layers below the earth`s surface collide with the surface layers. Softer layers of surface rock erode. Erosion and geological uplift often work together to create canyons. Parts of streams or rivers may be lifted with the earth during the geological uplift process. When rivers or streams flow over this elevated surface, waterfalls form. Over time, the power of the waterfall erodes the softer layers of rock below, causing the original river bed to collapse and a gorge to form. The Macocha Gorge in the Jihomoravsk region of the Czech Republic was probably caused by the collapse of an underground cave that had been eroded by the Punkva River.
The movement and melting of glaciers can also create canyons. Glaciers cut deep valleys on the surface of the earth. These rivers of ice can create huge gorges and steep and steep gorges. When glaciers melt or retreat, these gorges and ravines are exposed. The Columbia River Gorge in the U.S. states of Washington and Oregon was formed in part by the retreat of glaciers during the last ice age. Engineers deliberately flooded canyons to create streams and dams. These dams produce hydroelectricity or electricity that runs on water. The Three Gorges Dam on the Yangtze River in China is probably the most famous example of such a project. Upstream of the dam, the Qutang, Wu and Xilang Gorges were partially flooded to create a waterway. The new waterway would allow cargo ships to sail from the East China Sea, part of the Pacific Ocean, to the city of Chongqing, about 2,250 kilometers (1,400 miles) inland. The 26 turbines at the Three Gorges Dam produce about 18,000 megawatts of electricity for Shanghai and other cities.
However, many people are concerned about the environmental impact of the dam, criticizing the fact that more than a million Chinese families have been forced to leave their homes near the gorge to complete construction. Many geological discoveries have been made in canyons because canyons often expose layers of rock that date back thousands of years. The Olduvai Gorge in Tanzania has layers dating back 2 million years. Olduvai Gorge is famous for the ancient fossils and tools found by scientists Louis, Mary and Richard Leakey. These remains of ancient animals and plants provide evidence of early humans. A gorge is a narrow valley between hills or mountains with a stream of a river running through them. The gorges often have steep rock walls. A gorge is created by a change in the type of rock of a waterfall. At the base of a wall of water, the pressure and hydraulic action of the falling water causes erosion of the softer rock below and the formation of a plunge pool. .