How did the Colorado River carve the Grand Canyon?

The Colorado River began carving the Grand Canyon approximately six million years ago. Its immense cutting power is driven by a combination of rapid velocity, high volume, and a heavy load of mud, sand, and gravel that acts as an abrasive tool against the rock layers of the Colorado Plateau.12

The river’s ability to cut to a depth of over a mile was significantly enhanced by the tectonic uplift of the Colorado Plateau, which steepened the river’s path and encouraged deep entrenchment. While the river is responsible for the canyon's depth, its vast width is the result of other natural forces, including rain, wind, temperature fluctuations, and chemical erosion, which gradually wore away softer rock layers.12

Crucially, the region's semiarid climate prevents excessive slope wash from rainfall, which would otherwise erode the canyon walls and destroy the distinctive, multicolored rock structures that define the landscape today.12