# Science

If you scratch a penny with an steel file, will the copper of the penny rub off on the file, or the steel (iron) of the file rub off on the penny?

12. What can we determine from the above experiment about the relative hardness of copper and steel.

13. What is the hardest mineral?

14. What is the softest mineral?

15. Find out where tooth enamel is on the Mohs scale.

16. Why are drill bits often tipped with diamonds.

17. Give 5 minerals and their common uses in our lives.

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1. I bet you can answer some of these. Try and I suspect someone will help if needed.

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