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Yosemite's ultra-deep canyon may have been carved in part by a ghost volcano and river, provocative research suggests
A river that drained the slopes of a now-vanished volcano may have carved Yosemite Valley's depths during the last 10 million years.
A river that drained the slopes of a now-vanished volcano may have carved Yosemite Valley's depths during the last 10 million years.
