mass volume crystal structure particle shape
I gave my students this multiple choice question: Intense heat and pressure in Earth's crust can change sandstone into quartzite. During this metamorphosis, many properties of these rocks change. Which property of these rocks will most likely remain the same?

Only one answer is correct among these 4 choices:
- mass
- volume
- crystal structure
- particle shape

Could you tell me which one is correct?

mass