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South Rim October 20, 2008 |
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While the Colorado cuts a kerf like a sawblade, that is, cutting downward, indeed depositing imported
material along its banks, the Grand Canyon is much wider than the river bed ever was. The Canyon is located
on the Southern end of the Colorado Plateau, and the Plateau here slopes downhill toward the South. Runoff from rain and melting snow thus flows southward from Northern Arizona, and plunges into the Canyon, eroding away the lip to widen the canyon. Where a chink has been chipped out of the edge, more water flows through it, progressively wearing one of the many side canyons into the Plateau. [1] |
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