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Geology, • 1/2/26 How Volcanoes and Rivers of Lava Form Subterranean Caves Previous 1.8 Billion Years Old: Inside the Vishnu Basement Complex Next Ponderosa pines in the Coconino National Forest You Might Also Like Lava Dome Volcanoes Explained: Why Some Volcanoes Don’t Erupt 1887: Life, Loss & Justice in the Old-West Did a meteor strike help turn the Grand Canyon into a temporary lake 55,000 years ago? 1.8 Billion Years Old: Inside the Vishnu Basement Complex The Grand Canyon Tonto Group Transgressive model