Journey 2,891 kilometers below the surface to the seismic D layer at the core–mantle boundary. We unravel how Murakami and team solved the long-standing puzzle of the DO region, combining seismic imaging with high-pressure lab experiments that reveal post-perovskite alignment under CMB conditions. Discover how the deep, textured landscape of the lowermost mantle shapes Earth’s magnetic field, mantle flow, and the dynamic heart of our planet.

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