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 formed, grew and evolved over time remains a mystery, one that U.S. National Science Foundation -supported University of Utah-led researchers are seeking to plumb with the help of seismic waves from naturally occurring earthquakes. While this 2,442-kilometer-diameter sphere comprises less than 1% of the Earth's total volume, its existence is responsible for the planet's magnetic field, without which Earth would be a much different place.

https://www.miragenews.com/seismologists-peer-into-earths-inner-core-1063555/

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