science question?

Question

Minerals form when

a. liquids containing dissolved minerals evaporate
b. a liquid is turned into a solid
c. a solid is turned to a liquid and then back to a solid
d. heat and pressure from the earth's core erupt

7. Diamonds and graphite are both made of pure carbon, yet they have completely different characteristics from one another. What is perhaps one reason why this is so?

a. Diamonds are minerals, while graphite is not a mineral.
b. Graphite is a mineral, while diamonds are not minerals.
c. Diamond atoms are arranged closely together, while graphite atoms are layered in sheets.
d. Graphite atoms are arranged closely together ,while diamond atoms are layered in sheets.

Answer 1

Minerals form when heat and pressure from the earth's core erupt.
7. (Ans.C)Diamond atoms are arranged closely together, while graphite atoms are layered in sheet

Answer 2

The first question is odd.
-You can have evaporite minerals, like halite, when liquids evaporate.
-You can have minerals when a liquid turns into a solid. Ice is a mineral.
-You can have minerals when you have melting and solidification. The minerals crystallize as the liquid solidifies.
-D is oddly worded. Heat and pressure from Earth's core doesn't really erupt. Heat and pressure in the mantle and lower crust can cause eruptions.

So I am not sure what the answer is unless it is all of the above because you can have mineral formation in all those situations.

a) They are both minerals
b) They are both minerals
c) Bingo!
d) No.