The formation of the Grand Canyon was accomplished by the constant erosion of the rock by the Colorado River over some 17 million years. Over time the river was able to carve a very deep channel into the Colorado Plateau. Links are provided to specifics regarding the geology of the Grand Canyon.
Valleys.
In many cases, rivers are responsible for cutting valleys and canyons.
Erosion contributes to the formation of deep valleys and canyons by gradually wearing away the rock and soil over time through processes like water flow, wind, and ice movement. The continuous removal of these materials deepens and widens the valleys and canyons, creating the distinctive landforms we see today.
That is the correct spelling of the plural noun "canyons" (mountain valleys).
Canyons and valleys are typically formed by the erosion of rock and sediment by water, wind, or ice over long periods of time. They can also be created by tectonic activity, such as the shifting of Earth's crust along fault lines. Additionally, volcanic activity can form canyons and valleys as lava flows and subsequent erosion shape the landscape.
How valleys are made
Pluto has only been observed from orbit, so we don't know for sure, but it does appear from photos that there are valleys and canyons.
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deep sea canyons
Canyons and valleys are most likely formed by the erosive forces of water over long periods of time. This could include events such as heavy rainfall, flash floods, or the gradual flow of a river cutting through the landscape. Other factors like tectonic activity or glacial movements can also contribute to the formation of canyons and valleys.
there are some in canyons and some in valleys
V-shaped valleys in the continental shelf and slope are called submarine canyons. These are deep, steep-sided valleys that cut across the continental margin and are often formed by underwater processes such as turbidity currents or erosion by underwater currents. Submarine canyons can be comparable in scale to canyons found on land.