Hardest materials so far found is_________________?
Correct answer: D. Diamond
- A. Pumice stone
- B. Graphite
- C. Carborundum
- D. Diamond
Explanation
Diamond is the hardest naturally occurring material because its carbon atoms are held in a strong three-dimensional covalent lattice. Graphite is also carbon, but its layered structure makes it soft and lubricious.
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