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Scientists agree that the great crevice in the Earth’s surface was cut away by the flow of the Colorado River. However one question is still debated: when exactly did this erosion happen to form the Grand Canyon?
By QuickAndDirtyTips.com4.1
238238 ratings
Scientists agree that the great crevice in the Earth’s surface was cut away by the flow of the Colorado River. However one question is still debated: when exactly did this erosion happen to form the Grand Canyon?

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