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- There are three primary types of metamorphism—contact, hydrothermal, and regional.
- Contact metamorphism occurs along boundaries of igneous intrusions. It is local and driven by heat.
- Hydrothermal metamorphism is a local-scale type as well for the most part. Occurs widely along ocean ridges. Involves hot fluids and the ions it moves.
- Regional metamorphism involves increasing temperature and pressure over large volumes of crust. Typically occurs at converging plate boundaries.
6.10 Where does metamorphism occur?