Seismologists peer into Earth's inner core

At the center the Earth is a solid metal ball, a kind of "planet within a planet," whose existence makes life on the surface possible. How Earth's inner core…

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Seismologists peer into Earth's inner core

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U seismologists probe Earth's inner core – @theU

Up-to-fivefold reverberating waves through the Earth's center and distinctly anisotropic innermost inner core