General Knowledge
Solved MCQs
Medium
Question
The hardest natural substance on Earth is:
A
Gold
B
Iron
C
Diamond
✓ Official correct answer
D
Quartz
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
Gold
No member explanations yet for this option.
B
Iron
No member explanations yet for this option.
C
Diamond
No member explanations yet for this option.
D
Quartz
No member explanations yet for this option.
Explanation
Diamond ranks 10 on the Mohs hardness scale.