thumb|Grand Canyon, [[Arizona, at the confluence of the Colorado River and Little Colorado River.]]
A canyon is a deep, narrow valley with steep sides, typically carved out by a river over millions of years. Canyons like the Grand Canyon in Arizona are important natural landmarks that reveal Earth's geological history and attract millions of visitors for their dramatic landscapes.
AI-generated from the Wikipedia summary — may contain errors.
thumb|Grand Canyon, [[Arizona, at the confluence of the Colorado River and Little Colorado River.]]
A canyon (; archaic British English spelling: cañon), gorge or chasm, is a deep cleft between escarpments or cliffs resulting from weathering and the erosive activity of a river over geologic time scales. Rivers have a natural tendency to cut through underlying surfaces, eventually wearing away rock layers as sediments are removed downstream. A river bed will gradually reach a baseline elevation, which is the same elevation as the body of water into which the river drains. The processes of weathering and erosion will form canyons when the river's headwaters and estuary are at significantly different elevations, particularly through regions where softer rock layers are intermingled with harder layers more resistant to weathering.
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