Answer:
The three forces that affect the pressure and heat driving metamorphism are: a. The internal heat of the Earth: The heat from the Earth's interior, generated by radioactive decay and residual heat from its formation, plays a significant role in driving metamorphism. This heat can cause rocks to undergo changes in mineral composition and texture. b. The weight of overlying rocks: The weight of rocks above exerts pressure on the rocks below. This pressure, known as confining pressure, increases with depth and can contribute to the deformation and metamorphism of rocks. c. Horizontal pressures developed as rocks become deformed: During tectonic processes such as folding, faulting, and shearing, rocks can experience horizontal pressures. These pressures can cause the rocks to undergo deformation and metamorphism, resulting in changes in mineral alignment and texture. Option a (The internal heat of the Earth, the weight of overlying rocks, and horizontal pressures developed as rocks become deformed) is the correct answer as it includes all three forces that affect the pressure and heat driving metamorphism.
Step-by-step explanation: