It Took Eons to Make Grand Canyon Grand

(AP) -- Gazing into the majestic Grand Canyon, awe-struck visitors inevitably ask: "How old is it?" Far older than generally thought, says new evidence that scientists culled from caves lining the canyon's red limestone cliffs.

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<p><a href="http://www.physorg.com/news124041613.html">It Took Eons to Make Grand Canyon Grand</a></p> <p>(AP) -- Gazing into the majestic Grand Canyon, awe-struck visitors inevitably ask: "How old is it?" Far older than generally thought, says new evidence that scientists culled from caves lining the canyon's red limestone cliffs.</p>