Scientists have uncovered a missing chapter in the history of the Grand Canyon—nearly a billion years of rock layers that simply vanished. This mystery, known as the Great Unconformity, has puzzled researchers for decades. New evidence suggests ancient glaciers may have scraped away massive sections of Earth’s crust during a global ice age. This means entire landscapes – and their history – were erased long before humans existed. Watch now to uncover how a billion years of Earth’s story disappeared without a trace.
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