An ancient collision with Theia, a Mars-sized object, gave rise to the moon, and scientists now suspect they've found its remnants in Earth's deep mantle. Continue reading for more details.
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Located in the lowermost mantle on opposite sides of the Earth, the Large Low-Shear-Velocity Provinces (LLSVPs) extend laterally for thousands of kilometres. Not much is known about these bizarre giants because scientists are not able to access them directly.