Answer:Hot molten rock called magma and geothermal heat
Explanation: Metarmorphic Rock are formed from the break down of existing igneous and sedimentary rock as a result of the intrusion of magma and high pressure which brings about a change in the physical and chemical nature of the rock into a denser form called metarmorphic Rock. Also, it is formed as a result of geothermal heat and friction along the fault.