Lava is rock that has undergone a physical change and has liquefied. what is known about this change?
a. the lava gained mass.
b. the lava was burned into smoke.
c. the lava can cool back into rock.
d. the lava lost mass.

Lava is rock that has undergone a physical change and has liquefied. The cause of this change is that the lava can cool back into rock. The answer is letter C. When heat is applied into the rock, the forces holding the particles in the rock together are disrupted and the solid rock transitions into a liquid lava state. When heat energy is removed from the liquid lava, the particles become strongly attracted to one another and the substance slowly goes bock in its solid state.

C (lava can cool back into rock)

Explanation:

when lava is in it's liquid state, we know cooling a liquid will turn in it back into a solid. we are to use the same logic here also.

the other three are WRONG:

A and D are WRONG because mass will stay the same no matter what state of matter an object is in.

B is WRONG because the question explicitly states that the lava turned into a liquid and NOT SMOKE!!

The CORRECT ANSWER AGAIN IS C