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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.
Using a technique that can tell how deeply buried the canyon's rocks were at specific time intervals, scientists determined that western Grand Canyon was cut to within a few hundred meters of its present depth 70 million years ago, while eastern Grand Canyon (where most visitors see the canyon) was the site of a gorge of similar proportions to the modern canyon, but cut into Mesozoic-age rocks that are now completely stripped away.