How was it Created?
The specific geologic processes and timing that formed the Grand Canyon spark lively debates by geologists because the Colorado river carried away the clues as it carved the canyon. The main theory of how the Grand Canyon was naturally created was that the erosive action of water in the Colorado river is responsible for deepening the main channel. However, other forces, in particular debris flows (which are piles of mud and rock that flow), caused the widening of the canyon. Piles of loose rock and soil that originate in the river's tributaries and side streams merge to form powerfully erosive debris flows, which are capable of dramatically affecting and moulding the surrounding terrain. This results in steep-sided gorges and what we now know as the Grand Canyon.