Discuss Forum
1. Which of the following is the hardest rock?
- A. Granite
- B. Granite
- C. Granite
- D. Granite
Answer: Option D
Explanation:
Diamond is the hardest known mineral. It is a high-symmetry allotrope of carbon (C). It has a Mohs “scratch” hardness of 10, which makes it the hardest mineral.
Post your comments here: