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Topic:Gknowledge skills 18
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JulieAnn
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Dec 2019
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JulieAnnsays...
Friedrich Mohs, a mineralogist, sorted 10 minerals into an ascending level of hardness so that each mineral could scratch the mineral before it on the scale.
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Friedrich Mohs, a mineralogist, sorted 10 minerals into an ascending level of hardness so that each mineral could scratch the mineral before it on the scale.