The factors involved in the formation of metamorphic rocks are

Metamorphic rocks are formed by changes in pre-existing rocks through the application of heat and pressure. As the rocks are buried deep within the Earth's crust, they are subjected to high temperatures and pressures, causing them to undergo changes in their mineral composition, texture, and structure. These changes occur due to the recrystallization of minerals and the reorientation of grains in the rock. The heat and pressure cause the atoms and molecules within the rock to become more tightly packed, resulting in a denser and more compact rock. Therefore, the correct factors involved in the formation of metamorphic rocks are heat and pressure.