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Science
How hard are rocks?
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The hardness of a rock depends on the type of rock. For example: granite is harder than sandstone.
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The hardness of rocks depends on the Mohs, hardness scale, some have a scale of 2 and are very soft, and we can be scratched with some thing like a metal file, and some are as hard as a diamond, which have a Mohs hardness scale of a 7 and can only be scratched by another diamond.
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