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After weathering has broken some of the pieces of of a rock or a object erosions part comes in. Erosion carries the pieces to another place and the pieces start to form anotheâ¦r object leaving the other object with a cool shape such the grand canyon. 23 people found this useful.
The Grand Canyon began forming 17 million years ago at the western end in a west to east direction, and at a rather slow rate. Some time later, the east end of the Grand Canyon began forming from east to west, at a much more rapid rate. Eventually the two ends merged and the Colorado River emerged.However, some scientists suggest Polyak and Hillâs methods and interpretations may be too narrow or incomplete.owever, for the past 100 years or so, geologists have agreed, based on a robust data corpus, that the Grand Canyon is probably five to six million years old, even though the rock from which it is carved is up to two billion years old.