How was the Colorado plateau formed?

Ancient Precambrian rocks, exposed only in the deepest canyons, make up the basement of the Colorado Plateau. ... These rocks formed deep beneath the surface of the earth and were uplifted, eroded, and exposed for eons. By 600 million years ago North America had been eroded to a remarkably smooth surface.

Explanation:

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theodore roosevelt challenged william to a duel, whoever won, got their policy sent to congress. it ended up in a stalemate, and both men were injured and sent to the hospital.