Asked by Tony

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????
Answered by PsyDAG
Reverse the order. #1 is the <I>most</I> effective to scratch.
Answered by PsyDAG
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