How can one type or rock become many different types of metamorphic rock?
One parent rock can become many different metamorphic rocks because it may experience different amounts and types of heat, pressure, stress, and chemically active fluids. These conditions cause different minerals to recrystallize or form, producing different textures and rock types.
Suppose while hauling rocks, you accidentally drop one. It breaks apart in flat, planar sections. What type of rock did you just drop?
A foliated metamorphic rock, most likely slate, because it breaks along flat, planar cleavage surfaces.
Why do metamorphic rocks often form deep under the surface of the Earth?
Metamorphic rocks often form deep beneath Earth's surface because there they are exposed to high heat and pressure. These conditions cause minerals in existing rocks to recrystallize and rearrange without the rock completely melting.
How are metamorphic rocks classified? Identify the characteristics of each of these classifications.
Metamorphic rocks are classified as foliated or nonfoliated. Foliated rocks have minerals arranged in parallel layers, bands, or flat planes because of directed pressure. Nonfoliated rocks do not have a layered or banded appearance; their minerals are usually arranged randomly or form a uniform, interlocking texture.
How do hot fluids act in metamorphism?
Hot, chemically active fluids move through rocks, dissolving and transporting ions and allowing new minerals to form. They promote recrystallization and can change the rock’s chemical composition through metasomatism.
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