What is the hardest rock? What affects its strength? - Quora
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Which rock is the hardest? - Quora
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Which rock is the hardest? - Quora
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What is the hardest rock? What affects its strength? - Quora
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Which rock is the hardest? - Quora
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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
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What is the hardest rock? What affects its strength? - Quora
