Question

________is the hardest known material​

Answer 1

Answer:

diamond

Explanation:

A diamond ring. Scientists have calculated that wurtzite boron nitride and lonsdaleite (hexagonal diamond) both have greater indentation strengths than diamond. Source: English Wikipedia. (PhysOrg.com) -- Currently, diamond is regarded to be the hardest known material in the world

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Answer 2

Answer:

Diamond is the hardest known material.