The carving of a deep, steep-sided valley, typically by a river cutting downward through resistant rock faster than the surrounding land erodes outward, often aided by regional uplift that steepens the stream's gradient over geological time. The Grand Canyon's mile-deep gorge is the process's best-known result.
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1. Canyon, Wikipedia
Lead paragraph, first sentence (clause on river erosion)
A canyon (from Spanish canon; archaic British English spelling: canon), 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.
Lead paragraph, first sentence (clause on geologic time scales)
A canyon (from Spanish canon; archaic British English spelling: canon), 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.
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