Help please

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Number the items to show the most effective and the least effective to use to scratch the mineral to test its hardness. Use number 1 for the most effective and the 4 for the least efective.

Chalk(1)
Fingernail(2)
Steel screw(4)
Paper clip(3)

Am I correct????

  • Help please -

    Reverse the order. #1 is the most effective to scratch.

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