Erosion is the process of the earth is worn away by the action of water, glaciers,winds,waves,etc.

When the Grand Canyon was formed the Colorado river was mainly responsible for its depth.Wind and rain pounding on the sides of the canyon are two of the factors responsible for its width. At the top is 250 million year old limestone,these rocks help scientist determine earths age and learn more about how it formed.During the last ice age  

more than 16,000 years ago glaciers eroded enough of earths surface to create hills,valleys,and even The Great Lakes.

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