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Contents of Why study metamorphic rocks?

Why study metamorphic rocks?

• Metamorphic rocks
• form almost exclusively beneath Earth's surface (so metamorphic processes cannot be directly observed).
• are often found exposed in actively forming mountain ranges.
• are always found in eroded ancient mountain belts in continental interiors.
• and the minerals they contain make up such economic materials as talc, graphite, marble, garnet, corundum, and metamorphosed coals.