Question

Diamond is a non-metal but still the ____ natural substance known.​

Answer 1

Answer:

Diamond is essentially carbon. And as we know that carbon is a solid non-metal element. Also, carbon can exist in different forms on earth. Diamond is one form of carbon which is formed at extreme thermodynamic conditions.

Explanation:

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Answer 2

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Diamond is a non-metal but still the hardest natural substance known.

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