It took eons to make Grand Canyon grand
(AP)
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This undated handout photo provided by the journal Science, shows caves in the Redwall Limestone in Marble Canyon, eastern Grand Canyon, in Arizona. Gaze into the majesty of the Grand Canyon and inevitably awestruck visitors ask: How old is it? Far older than most tourists today learn, says new evidence that scientists culled from caves that line the canyon's red limestone cliffs. (AP Photo/Science, Victor Polyak)
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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