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the hardest naturally occurring substance found on Earth is Diamond
The hardest substance is b. Diamond
B.Diamond (Alloropes of carbon)
the diamond is the hardest
B. Dimond
It is Diamond, Please refer to Moh's scale in General Geology
B Diamond
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The hardest substance available on earth is option B. Diamond
The hardest substance on earth is diamond (10 on the Mohs scale)