The subordinate clause here is A, "as the layers of ash slowly compressed". Subordinate means that it cannot exist on its own, it has to be a part of the main, independent clause.
I have no answer I have never ever ever evr read that book srry about that just surch the web for a summery on those chapters then rephrase and you'll be good to goo
She must be confused on what just happened to I assume
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