The Grand Canyon may owe its shape to a giant ancient lake that, after collecting water for a million years, finally couldn't hold any more. A new study in Science backs... The Grand Canyon may owe its shape to a giant ancient lake that, after collecting water for a million years, finally couldn't hold any more. A new study in Science backs the long-argued "lake spillover" idea, suggesting the ancestral Colorado River o... [1261 chars]
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