Question

Solid rocks exposed to changes in thermal energy, pressure, or the addition of chemical fluids form metamorphic rocks. Igneous, NOT metamorphic, rocks will form if _______.

A. the pressure decreases
B. the heat is withdrawn
C. the rock melts
D. the rock contains minerals

Answer 1

Answer: Igneous rocks form from the cooling and solidification of magma or lava. This process occurs when a rock melts. So, igneous rocks, not metamorphic rocks, will form if the rock melts. Therefore, the correct answer is C. the rock melts.