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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 materials
it is not A
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