Bouncing seismic waves reveal distinct layer in Earth's inner core

Data captured from seismic waves caused by earthquakes has shed new light on the deepest parts of Earth
Data captured from seismic waves caused by earthquakes has shed new light on the deepest parts of Earth's inner core, according to seismologists from The Australian National University (ANU).

What is the Earth's inner core composed of and how do we know? How can seismic waves be used to predict the composition of the inner core? - Quora

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Eurasia Review – Page 375 – Eurasia Review

450-mile-wide solid metal ball forms Earth's innermost core, earthquake waves reveal

Scientists discover shocking new detail about Earth's core

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Earth's Core: The Enigma 1,800 Miles Below Us - The New York Times

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