The true statements about shale and schist are:
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Minerals in shale react to form new minerals in schist - This is true as the process of metamorphism causes the minerals in shale to chemically change into new minerals characteristic of schist.
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High temperature and pressure can change shale into schist - This is also true. Shale is a sedimentary rock, and when it is subjected to high temperatures and pressures during metamorphism, it can transform into schist.
The statement that shale and schist are both types of metamorphic rock is false, as shale is a sedimentary rock, while schist is a metamorphic rock.