Ancient driftwood found in Stanton’s Cave, about 40 meters above the Colorado River in Grand Canyon National Park, Ariz., hinted at a catastrophic landslide occurring more than 50,000 years ago.
The rare earth element niobium was likely dragged to the surface as the supercontinent Rodinia broke apart more than 800 million years ago. Credit: Artem Topchiy/Wikimedia, CC BY-SA 3.0 For much of ...
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