Which is the hardest natural substance on Earth?

About this MCQ

This Easy Everyday Science question asks: Which is the hardest natural substance on Earth? The correct choice is C. Diamond. Read the options below, commit to one, then use the explanation to see why that choice holds and why the others do not.

Everyday Science items like this one are written for Pakistan exams such as CSS, FPSC, PPSC, and NTS. The difficulty label is a hint about how much of the topic the stem assumes, not a score. Tags and exam names, when they are present, tell you where else the same idea is tested. Previous and next links stay in Everyday Science so you can continue the subject. Related questions point at nearby stems if you want another angle on the same idea.

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Correct answer

C. Diamond

Explanation

Diamond is the term that matches “Which is the hardest natural substance on Earth” (option C). Option A (Gold) is wrong: Gold is soft and malleable. Option B (Iron) is wrong: Iron is hard relative to many metals but far softer than diamond. Option D (Quartz) is wrong: Quartz is hard (Mohs 7) but diamond is Mohs 10. Keep Diamond as the Everyday Science fact for this stem.

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