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????
Chalk(1)
Fingernail(2)
Steel screw(4)
Paper clip(3)
Am I correct????