Two Continent-Sized Blobs Inside Earth That Nobody Understands

https://www.space.com/nobody-understands-the-giant-mantle-blobs.html?utm_source=sdc

Near the bottom of Earth’s mantle lie two continent-sized blobs of hot, compressed rock. They are called large low-shear-velocity provinces (LLSVPs) because seismic waves slow down as they pass through them, but geologists usually just call them “the blobs.”
(Photo courtesy of livesciemce.com)
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