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Geology, • 1/2/26 Inside a Tube of Lava: How These Strange Caves Form Previous The Grand Canyon: A Geologic History Next How Elevation Affects Temperature You Might Also Like How Wild Bison Ended Up in the High Desert Plains of Arizona How Volcanoes and Rivers of Lava Form Subterranean Caves The Real Story Behind America’s National Parks (It’s Not Just Teddy) 1.8 Billion Years Old: Inside the Vishnu Basement Complex Cinder Cone Volcanoes Explained in Under 5 Minutes