Biology, 24.04.2020 01:17 aalyyy

7. A rock has three minerals in itOne of them, quartz, has a hardness of 7 The secondfeldspar, has a hardness of 4. The third, biotite, has a hardness of 2.5. What is true about the hardness of rock?

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7. A rock has three minerals in itOne of them, quartz, has a hardness of 7 The secondfeldspar, has a...