Question

Which is the hardest material present on earth​

Answer 1

Answer:

Diamond is the hardest material present in the earth.

Answer 2

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The hardest substance known is diamond. [but see note below] Diamond is made up entirely of the element carbon. (Another thing that is made entirely of carbon is graphite, one of the softest substances.) Diamond's hardness is roughly 10.5-14.5 million psi.

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