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Who was the first person to tell about the Core?

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Who was the first person to tell about the Core?

(a) Graham Bell

(b) Albert Einstein

(c) Isaac Newton

(d) R.D. Oldham

This question was posed to me in final exam.

Question is from The Mantle, The Core in chapter Internal Structure of the Earth of Engineering Geology

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Right option is (d) R.D. Oldham

For explanation I would say: The existence of the core was suggested by R.D. Oldham in 1906 and subsequently confirmed by other seismologists.

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