Multiple choice

The hardest substance available on the earth is _____.

  1. Platinum

  2. Coal

  3. Diamond

  4. Gold
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Diamond is the hardest known natural mineral on Earth, scoring 10 on the Mohs hardness scale. Its exceptional hardness comes from the strong covalent bonds between carbon atoms arranged in a tetrahedral lattice structure.

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