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Metamorphic Rocks Cornell Notes pg. 141 What are Metamorphic Rocks? • Rocks in which original structure, texture, or mineral composition of the rock have changed. • Changes caused by heat, pressure, or both. Think and discuss… • What kinds of rocks can become metamorphic rocks? • What causes rocks to change into metamorphic rocks? What is Contact Metamorphism? • Rock is heated by nearby magma as magma moves through crust. What is Regional • Pressure builds up Metamorphism? in rock buried deep below other rocks or when pieces of the Earth’s crust collide. How do heat and pressure change rocks? • Composition – Minerals present in original rock may be changed into new minerals when temperature or pressure change. How do heat and pressure change rocks? • Texture –Foliated: mineral grains are arranged in bands • Gneiss –Nonfoliated: mineral grains NOT arranged in bands • Marble Foliated Rock • Pg. 47