Refer to the Mohs Scale of Hardness. Recall that: o is the softest
o is the hardest
o Topaz is softer than
o The two items on this chart that can be scratched by a fingernail are and
o Two materials that can be scratched by an iron nail are and
o Two minerals that cannot be scratched by glass are and
o What is the substance that can be scratched by an iron nail but not a penny?
Please answer with the right answers