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Metamorphic Rocks - Coggle Diagram
Metamorphic Rocks
Metamorphic Rocks form when existing rocks are changed by heat and pressure
Metamorphism is a very appropriate name this process because it means to change form.
Rocks produced during metamorphism often look much different from the original rocks, or parent rocks
Most metamorphic changes occur at elevated temperatures and pressures.
These conditions are found a few kilometers below Earth’s surface and extend into the upper mantle.
Most metamorphism occurs in one of two settings-contact metamorphism or regional metamorphism
Contact Metamorphism
During contact metamorphism, hot magma moves into rock
Regional Metamorphism
Regional metamorphism results in large-scale deformation and high-grade metamorphism
Agents Of Metamorphism
The agents of metamorphism are heat, pressure, and hydrothermal solutions
Heat
The most important agent of metamorphism is heat
Heat provides the energy needed to drive chemical reactions
Classification of Metamorphic Rocks
The texture of metamorphic rocks can be foliated or nonfoliated
Foliated Metamorphic Rock
A Foliated Metamorphic Rock is a rock that has a layered or banded appearance
Nonfoliated Metamorphic Rock
A metamorphic rock that does not have a banded texture is called a Nonfoliated Metamorphic Rock