issb general knowledge MCQ #331

Hardest natural substance?

issb general knowledge MCQ #331

  1. Question 1

    Q1. Hardest natural substance?

    • A) Iron
    • B) Diamond
    • C) Quartz
    • D) Granite

    Answer: Diamond

    Explanation: Diamond is the hardest naturally occurring material. This fact often appears in ISSB academic and general knowledge sections.