1. Burial and Heat:
* Igneous rocks can be buried deep beneath the Earth's surface.
* The immense pressure and heat from the surrounding rocks cause the original mineral composition and texture of the igneous rock to change, transforming it into metamorphic rock.
2. Regional Metamorphism:
* Igneous rocks can be caught within zones of tectonic plate collisions (like mountain building).
* The intense pressure and heat generated during these collisions can completely change the igneous rock's structure and mineral content, forming metamorphic rocks.
Key Point: Both pathways involve heat and pressure, but the source and intensity of these factors can vary depending on the specific geological context.
