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July 1, 2015

Homework Help: Help please

Posted by Tony on Monday, January 28, 2013 at 8:17pm.

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????

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