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Metamorphic Rock

Chapter 4.4 Metamorphic Rock

QuestionAnswer
Metamorphic Rocks Rocks in which the structure, texture, or composition of the rock has changed.
How changes in rock occur All three types of rocks can be changed by heat, pressure, or a combination of both.
How heat and pressure change a rock Heat and pressure cause the minerals in a rock change.
Contact Metamorphism Magma comes in contact with igneous rock intrusions. The increase in temperature causes the minerals to change into other types of minerals.
Regional Metamorphism Pressure builds deep below the earth's surface or when large pieces of the crust collide. The increase in temperature and pressure causes rocks to become deformed and change chemically.
Index Minerals Metamorphic Minerals that can only form at certain temperatures and pressure and can be used by scientists to estimate temperature, pressure, and depth at which a rock undergoes metamorphosis.
Two textures of Metamorphic Rock Foliated or Nonfoliated
Foliated Mineral grains are arranged in planes or bands.
Nonfoliated Mineral grains are not arranged in planes or bands.
Recrystallization Minerals crystals that change in size or composition due to heat and or pressure.
Deformation Change is the shape of a rock caused by the force placed on it. Rocks can be squeezed or stretched and rocks can bend or fold.
Created by: Anita
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