Ask your own question, for FREE!
Mathematics 7 Online
OpenStudy (anonymous):

Which statement is true for all minerals? A. They have a crystalline structure. B. They contain useful metals. C. They are made of silicon and oxygen. D. They are too hard to be scratched with a nail.

OpenStudy (anonymous):

Welcome to openstudy!! :) I think that it is c. But I am not entirely sure

Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!
Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!