Seismic waves and meteorites.
We can learn about the layers that make up the Earth by understanding how waves behave as they pass through various materials. According to seismic waves, the Earth's interior is made up of a number of concentric shells, including a solid inner core, a liquid outer core, a mantle, and a thin outer crust. When it was observed that P-waves were deflected inward, creating a "shadow zone" at the surface, the "outer core" was identified. The outer core may be in the liquid state since the S-waves do not flow through it.
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