Scientists discover 'quadrillion tons of diamond' beneath Earth's surface
Scientists believe there could be more than a quadrillion tons of diamond scattered beneath the Earth's surface. The diamonds were found by analysing seismic records - essentially sound waves travelling through the Earth triggered by ground-shaking forces. Dr Ulrich Faul, a research scientist at MIT, explained that one of diamond's many special properties is the speed at which sound waves travel through the material.
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