Summary
The rocks at the bottom of the Grand Canyon are about half as old as Earth.
The Vishnu rocks at the bottom of the Grand Canyon are 1.8-2 billion years old. Since Earth is 4.5 billion years old, these rocks are nearly half as old as our planet. The canyon itself was "only" carved by the Colorado River 5-6 million years ago. 5 million tourists visit these ancient rocks each year.
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