What you're looking for in here is the hardness: a material can scratch another material if it's harder than it.
So the desired material cannot be harder than amphibole, which has a hardness of 6.
But it has to be harder than fluorite, which has a hardness of 4.
So we're looking for a hardness of between 4 and 6 and from the table we see it's magnesite (we'll need a hard magesite) - this is the correct answer!
The importance is that so you don’t have any greenhouse gases that could practically harm our earth in the present world
Answer:
The answer would be A, D, and B
Explanation:
I took the quiz and got it correct:)