When picturing Earth's heart we might imagine a pinball spinning beneath layers of gooey toffee and caramel.
"For the first time we confirmed that this kind of inhomogeneity is everywhere inside the inner core,"By inhomogeneity, Pang means Earth's inner core isn't one uniform mass, but riddled with texture that serves as a record of how it formed – and may evolve under sustained geodynamical forces and torques.
"This signal that comes back from the inner core is really tiny. The size is about on the order of a nanometer,"University of Utah seismologist and study author Keith Koper."So these baby echoes and reflections are very hard to see" in seismic data. Earth's inner core creates a patchwork of seismic wave scattering strengths. Scattering becomes stronger closer to the core's center .
This patterning suggests Earth's inner core went through a period of rapid growth, then slowly began to harden into the solid lump of mostly iron we know it is today.
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