Which of the following materials is usually regarded as the hardest substance available on Earth?

Options :
  1. Platinum
  2. Coal
  3. Diamond
  4. Gold
Answer and Explanation :-

Answer: Option 3

Explanation:

Diamond is the hardest known natural material on the Mohs scale of mineral hardness, where hardness is defined as resistance to scratching and is graded between 1 (softest) and 10 (hardest). Diamond has a hardness of 10 (hardest) on this scale. Diamond's hardness has been known since antiquity, and is the source of its name.

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Maybe the truth was, it shouldn't be so easy to be amazing. Then everything would be. It's the things you fight for and struggle with before earning that have the greatest worth. When something's difficult to come by, you'll do that much more to make sure it's even harder--if not impossible--to lose.
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