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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Iknow what you are working on the correct answer is c

The geographic feature in the westernmost corner of kenya is answer: the great rift vally