Gary has a piece of diamond and a piece of graphite. he wants to test the hardness of these two minerals. when he rubs the diamond against the piece of graphite, the graphite gets scratched. when he rubs the piece of graphite against the diamond, the diamond does not get scratched. which of these is true? a. the graphite is harder than the diamond. b. this test does not show which mineral is harder. c. the diamond is harder than the graphite. d. both minerals have the same hardness.
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