“Two continent-size masses occupy as much as 30% of the core-mantle boundary, one of them thousands of kilometers below Africa, the other under the Pacific.”

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https://www.quantamagazine.org/earths-core-appears-to-be-leaking-up-and-out-of-earths-surface-20250804/

Fun terrestrial geology review. The crystalline structure of the blobs may play a role in transferring material from the core to mantle.