There might be a quadrillion tons of diamonds 100 miles below Earth鈥檚 surface. But the farthest we鈥檝e traveled is 7 miles down, so how could we know that?
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There might be a quadrillion tons of diamonds 100 miles below Earth鈥檚 surface. But the farthest we鈥檝e traveled is 7 miles down, so how could we know that?
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