15. 2. How are Metamorphic Rocks Formed? Formed under tremendous heat, great pressure, and chemical reactions Can cause new minerals Made at plate boundaries Metamorphism is changing one type of rock into another as a result of heat pressure and/or chemical reaction.
17. Foliated– mineral crystals are arranged in parallel layers or bands (ex. Schist, slate, and gneiss) b. Nonfoliated– rocks are not banded and do not break into layers (ex. Marble and quartizite) 3. Types of Metamorphic Rocks
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