Question

million years ago, this place (the top layer of the Grand Canyon), and all of the American Southwest, was a vast sea of sand

Answer 1

The erosion brought on by the Colorado River at Grand Canyon turned the area into a vast sea of sand

What changed on the Grand Canyon throughout time to give it its current appearance?

• The Colorado River started working on the rock some 5 to 6 million years ago, and although it has not yet been definitively proven, erosion brought on by the river's continuous passage opened up the Canyon and permanently altered the landscape.
• The Grand Canyon, we see now may not exactly match the one that existed roughly a century ago and may not be exactly as it was then due to the river's continued passage through and alteration of the landscape of this remarkable geological feature.

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