
The Western United States’ Green River seems to have taken the path of most resistance to reach the Colorado River. New research, however, reveals that it may have had help from a hidden phenomenon.
The Green River—the Colorado River’s largest tributary—represents an enduring geological mystery. How did it carve through the Uinta Mountains in Utah instead of going around them? At one point in its history, the Green River even appears to have flowed uphill, climbing into the…

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