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What is the thickness of the inner core?

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What is the thickness of the inner core?

(a) 790 km

(b) 1790 km

(c) 2790 km

(d) 3790 km

I had been asked this question in a job interview.

Asked question is from The Mantle, The Core topic in division Internal Structure of the Earth of Engineering Geology

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The correct answer is (b) 1790 km

For explanation: The inner core, is believed to be in solid metallic state and is said have thickness of about 1790 km.

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