Metamorphic Rocks

5 important questions on Metamorphic Rocks

What is metamorphic grade ?

It is the degree to which parent rock changes during metamorphism

Is metamorphic state always liquid and igneous state solid?

No, it is metamorphic state is always solid, while igneous is always solid

What is contact metamorphism?

- occurs in high temperature
- low pressure
- crystal is typically dark, fine grained, hornfelds, with porphyroblasts
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What is subduction metamorphism?

- high pressure
- low temperature
- blueshist rocks

What is regional metamorphism?

- high temperature
- high pressure
- convergence and collision to produce mountain building
- (metamorphic grade increases)

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