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.
Am I correct????
Help please - PsyDAG, Tuesday, January 29, 2013 at 12:06pm
Reverse the order. #1 is the most effective to scratch.
Science - PsyDAG, Tuesday, January 29, 2013 at 12:08pm
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