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Grand Mesa, one of Earth’s largest landforms, towers over the scenic city of Grand Junction, Colorado, like an 11,000-foot-high dinner table.
Sitting near the edges of the red-rock Colorado National Monument, the world’s largest flattop mountain was formed nearly 10 million years ago from an ancient lava flow that filled a river canyon. “In cross-section, the mesa resembles a giant layer cake that has been nibbled away from the sides,” says Rex Cole, emeritus professor of geology at Colorado Mesa University.