When a shale metamorphoses into a slate why do some slates contain muscovite and some slates contain chlorite?
A) The chlorite slates form at different pressures than the muscovite slates.
B) The chlorite slates have a different composition than the muscovite slates.
C) The chlorite slates form at different temperatures than the muscovite slates.
D) The chlorite slates form at different temperatures and pressures than the muscovite slates.
Answer: B
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