In 1977, geologist Marie Tharp hand-drew the first complete map of the ocean floor—and accidentally revealed a hidden world that rewrote our understanding of Earth itself. Her meticulous sketches uncovered the largest mountain range on our planet, sparked the plate tectonics revolution, and showed us that the ground beneath our feet is far more restless than we ever imagined. Hosted by Simplecast, an AdsWizz company. See https://pcm.adswizz.com

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