Two massive, unusual structures, dubbed low shear velocity provinces, have been discovered deep beneath Africa. Scientists believe these formations, hundreds of kilometers thick, are composed of ancient oceanic crust that subducted into the mantle millions of years ago. Their unique composition and density cause seismic waves to slow, influencing volcanic activity and heat flow on the surface.from Science News: Fresh Discoveries, Research & Breakthroughs https://ift.tt/Goe59VX
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