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For questions about the Earth's core. The center of the Earth is primarily iron-nickel.

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Why does seismic activity shed light on the inner core rigidity?

Reading Introduction to Geology (MIT 2005) and Wikipedia's article on Earth's inner core, it is specified that: Earth was discovered to have a solid inner core distinct from its liquid outer core … Why does seismic activity would result in the conclusion that the inner core is rigid? What is the link between seismism and inner core? …
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