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17 November, 14:26

A shale is metamorphosed into four rock types: (1) a banded gneissic rock; (2) a schist with small mica crystals with a shiny aspect; (3) a very shiny schist with large mica crystals; and (4) a dull slate with cleavage. Which of the following lists these rocks in order of increasing metamorphic grade?

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  1. 17 November, 16:12
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    4, 2, 3, 1

    Explanation:

    A shale is metamorphosed into four rock types: (1) a banded gneissic rock; (2) a schist with small mica crystals with a shiny aspect; (3) a very shiny schist with large mica crystals; and (4) a dull slate with cleavage. Which of the following lists these rocks in order of increasing metamorphic grade?

    A dull slate with cleavage

    A schist with small mica crystals with a shiny aspect

    A very shiny schist with large mica crystals and

    A banded gneissic rock.
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