What does the Vishnu Schist tell you about the history of the Grand Canyon prior to the formation of the canyon itself?

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Which layer surrounds the center of the earth? a: crust b: core c: mantle

How does rain water cause erosion and deposition? a. when acidic water soaks into the ground, water dissolves limestone, resulting in the formation of caves.b. when a river overflows it moves downhill resulting in the formation of caves.c. when it rains, water flows into rivers and streams and moves back to land, resulting in the formation of caves.d. when water empties into lakes, sediment is deposited, resulting in formation of caves.