Metamorphic Rocks

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What are metamorphic rocks?

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Metamorphic rocks are rocks that have been changed from their original form due to heat, pressure, or chemically active fluids.

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What is foliation in metamorphic rocks?

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Foliation is the alignment of mineral grains within a rock, resulting in a layered or banded appearance.

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What is non-foliated texture in metamorphic rocks?

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Non-foliated texture refers to metamorphic rocks that do not have a layered or banded appearance, often due to the absence of significant pressure.

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What is contact metamorphism?

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Contact metamorphism occurs when rocks are heated by nearby molten magma, causing changes in mineral composition and texture.

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What is regional metamorphism?

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Regional metamorphism occurs over large areas under high pressure and temperature, often associated with tectonic forces.

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How does pressure affect metamorphic rocks?

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Increased pressure can cause minerals to recrystallize, leading to changes in texture and structure of the rock.

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How does temperature affect metamorphic rocks?

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Higher temperatures can cause minerals to become unstable and transform into new minerals, altering the rock's composition.

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What is the role of fluids in metamorphism?

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Fluids can facilitate the movement of ions and promote chemical reactions, leading to changes in mineral composition during metamorphism.

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Can metamorphic rocks change names?

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Yes, metamorphic rocks can change names based on the degree of heat and pressure they have experienced.

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What is an example of a foliated metamorphic rock?

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An example of a foliated metamorphic rock is schist, which has visible layers of minerals.