Final answer:
Heat from a magma chamber and pressure from tectonic plate collisions are two forces that produce metamorphic rocks.
Step-by-step explanation:
Metamorphic rocks are formed when pre-existing rocks are altered by heat and/or pressure. Two forces that produce metamorphic rocks are:
- Heat from a magma chamber: When a magma chamber is nearby, the heat it emits can cause the surrounding rocks to undergo metamorphism. The high temperatures from the magma heat up the rocks and change their mineral composition.
- Pressure from tectonic plate collisions: During tectonic plate collisions, intense pressure is exerted on the rocks. This pressure causes the minerals in the rocks to realign and form new minerals, leading to the formation of metamorphic rocks.