What evidence tells scientists that earth's core is solid?

Seismic waves traveling through the earth refract for the same reason that light refracts when entering different substances (e.g. air, water). The inner corehas a different density from the outer core, and this difference in density tells us that it is solid.

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Answer mauritania is in the northwestern part of african, meaning its in the western hemisphere, and how do i know/ the map showed me so; ///: )