A new study suggests that material from Earth's core is leaking into the mantle and reaching the surface. The research, which challenges the long-held belief of an impassable core-mantle boundary, is based on the discovery of primordial isotopes like helium-3 and ruthenium-100 in volcanic rocks.

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

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