When metamorphic rock melts and turns into lava, ___ is conserved.

A. Density

B. Matter

C. Area

D. Volume

The Answer is B. Matter, matter cannot be destroyed only conserved and changed

The answer is B) Matter

Matter refers to anything that has mass and takes spaces. When metamorphic rock melts into lava, the atoms and molecules in the lava is not different from the one that exist in metamorphic rocks. The lava just has liquid forms with pretty much higher temperature.