What is a narrow valley found between steep rocky cliffs that was formed by a down cutting stream or river

Anarrow valley found between steep rocky cliffs that was formed as a result of cutting down by stream or river is called a canyon. this is because rivers have tendency to erode rock and continuous flow of river over years causes the creation of canyons. they often contribute to scenic views. 

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Bruh i don’t know the answer tbh but you can google it