https://www.livescience.com/planet-earth/an-ocean-of-magma-formed-early-in-earths-history-and-it-may-still-influence-our-planet-today-study-finds
Remnants of a liquid layer of magma near Earth's core, formed in the first few hundred million years of the planet's history, may still persist today as odd anomalies in the mantle.
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