A river and erosion
A river carves out a canyon. It is an example of erosion.
The Colorado River forms the Grand Canyon
A river
erosion
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a valley is the space between two hills while a river forms a canyon
There are no volcanoes in the Grand Canyon.
Colorado River
a river forms a canyon a Vally is the space between two hills
a valley or a canyon
It's often called a trench.
According to dictionary.com it is from the word "canna" or "cane"