They're called "Large low-shear-velocity provinces" and basically they're big blobs of dense rock in the lower part of the mantle. They mess with the Earth's magnetic field.
Now we have a new theory as to what they are. In Earth's early history, it collided with another planet, Theia. One huge chunk flew off into space and became our moon.
The theory is that the LLSVPs are bits of Theia's mantle, which was denser than Earth's. Weird, eh?
And one of them is right under Africa.
Why do I see some vague plotbunny here?
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