Earth Science

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Metamorphic Rocks

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Metamorphism:

A very slow process of physical

and chemical change within pre-existing rocks in response to changes in

temperature and pressures beneath the earth’s surface.

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Diagenesis:

A process that usually occurs

below 200°C and pressure below 2000 atmospheres (0.2 GPA),

it is the process of how sedimentary rocks are changed, but occurs at lower

pressures and temperatures than metamorphism.

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