yes
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Ummm ya it is! Wasn't 7th grade harder than 6th grade? I think that every time that you move up a grade everything gets harder.
I think it is harder than math. You usually need to get straight A's on math to get into pre algebra
What is 5 times stronger than metal? Steel - Because steel is a compound which steel is like a hard rock! Unbreakable! Steel can be even harder then ever which means it can be stronger then 5 more like 100 but that is only SOME types! Steel is way harder, yes 5 times harder!
no
Marble, being composed almost entirely of the mineral calcite, would have a white streak. The same colour as calcite's streak.