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Discussion :: Lithosphere

  1. Which of the following are Metamorphic rocks?

  2. A.

     Gneiss and Mafic

    B.

     Gneiss and Schist

    C.

     Schist and Mafic

    D.

     Schist and Chalk

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    Answer : Option B

    Explanation :

    Schist and gneiss are produced by medium to high grade metamorphism. In some cases gneisses are produced by higher grade metamorphism than schists. Low-grade metamorphic rocks tend to be fine-grained (the newly formed metamorphic mineral grains that is). High-grade metamorphic rocks tend to be coarse-grained.


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