يمكن تجاهلها فحص لا اريد hardest rock in the world قطعا تفتيش التوأم
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What is the hardest rock on earth? | Trivia Questions | QuizzClub
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Get to Know about the Hardest Rock on the Earth.
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If diamond is the hardest rock on earth (and hard by definition is solid, firm, and resistant to pressure; not easily broken, bent or pierced), and it can break with a hammer
11 Hardest Minerals In The World | On Mohs Scale - RankRed