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Contents of 3.2 Can rocks be classified according to the processes that form them?

• Three classes of metamorphic rocks
• Regional metamorphic rocks
• Occur across vast regions like convergent plate boundaries
• Pressure-driven changes primarily
• Contact metamorphic rocks
• Thermally driven and common along boundaries of igneous intrusions or under lava flow zones
• Hydrothermal metamorphic rocks
• Driven by hot-fluid chemical changes
• Often associated with one or both of the previous types