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Through the erosion and indentations. Formation down cutting it leaves forms of a river or ocean carved. Using range you can see how the floor of the canyon were an ocean floor. Erosion is caused by water the Grand Canyon sits on a body of water unlike most canyons this one happened to erode and sediment the body where the water once was. A layer of rock is also apparent which you wouldn’t be able to see unless erosion happened and etc.

The geologists know the presence of the vast sea at Grand Canyon by the erosion and indentations.

Grand Canyon in Arizona has been the rock sediment. It has been determined to be the vast sea due to the presence of oceanic floors. The erosion of the rocks results in the formation of the land over a vast period of time.

The rock indentation results in the formation of the mountains. The rock has been indented with the force thus, there has been the oceanic force that results in the indentations.

Thus, the erosion and indentations have resulted in the formation of the Grand Canyon by a vast sea.

For more information about the geological study, refer to the link:

https://brainly.com/question/13394878

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