Question

when metamorphic rock melts and turns into lava, ______ is conserved. a. matter b. area c. density d. volume

Explanation:

According to the law of conservation of mass, in a physical or chemical change, matter is neither created nor destroyed. When metamorphic rock melts into lava, it is a physical - change process and matter is conserved. Area, density, and volume can change during the melting process. For example, the shape change during melting affects area, and the change in state can affect density and volume.

Answer:

A. matter