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13 November, 10:27

Bubba wants to determine a mineral's hardness because he loves them so much. He can scratch the mineral with an iron nail but cannot scratch the mineral with a penny. What is the approximate hardness of Bubba's mineral? A. Less than 2.5. B. 4.5 to 5.5

C. 3.5 to 4.5

D. 2.5 to 3.5

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  1. 13 November, 11:14
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    Answer: it is 3.5 to 4.5 C. On EDGE

    Explanation: Hardness of Common Objects

    2.5 - fingernail

    3. - copper penny

    4. - iron nail

    5.5 - glass

    (Mohs Hardness Scale)
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