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Grand Canyon much older than previously thought (Reuters)

This undated picture shows a view of the thick layers of limestone that contain numerous caves in the Grand Canyon in Arizona. A team of scientists from the University of New Mexico said in a study published in the journal Science that the Grand Canyon began to form 17 million years ago, making it older than previously thought. (Handout/John 'Doug' Powell/Reuters)Reuters - The Grand Canyon, carved out over
the eons by rushing river water, began to form 17 million years
ago, making it nearly three times older than previously
thought, scientists said on Thursday.

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