Multiple choice general knowledge science & technology

The hardest substance available on earth is

  1. Gold

  2. Coal

  3. Diamond

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

Diamond is the hardest known naturally occurring substance on Earth, ranking 10 on the Mohs scale of mineral hardness. Its exceptional hardness comes from the strong covalent bonds between carbon atoms in its crystal structure.

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