Which of the following best explains a hardness scale? A. a scale that tests the hardness of a mineral by scratching other materials B. a scale that tests the hardness of a rock by scratching other materials C. a scale that tests the hardness of a mineral by being rubbed on other materials D. a scale that tests the hardness of a rock by being rubbed on other ma

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Answer 1

A. a scale that tests the hardness of a mineral by scratching other materials