Basically.
If you mean canyon, such as the Grand Canyon, they are made by erosion. Water flowing through them cuts into the earth and washes it away.
Grand canyon
Because it cut through the earth surface and creates a canyon
Hells canyon.
It is an exposed slice into the crust of the earth.
If the canyon spans the whole earth then you turn around and face the other way, since the Earth is a globe and you are already on the other side of the canyon.
The Grand Canyon was creatd by water and is the largest valley on earth in Arizona.
chuck norris
the grand canyon
The Great Canyon of Yarlung Tsangpo River, located in Tibet is the largest canyon on Earth, but the largest known canyon is Valles Marineris, located on Mars.
A long narrow cut in the Earth caused by running water is called a canyon. Canyons can be formed by rivers cutting through rock over time, creating dramatic landscapes with steep walls and deep valleys.
Mars. Valles Marineris would hold the whole of Earth's Grand Canyon is one of its side canyons. In addition, its largest volcano -- Olympus Mons -- is larger than any volcano on our planet.