Which is the subordinate clause in the sentence?
As the layers of ash slowly compressed, partially burned flowers changed into fossils.
a. as the layers of ash slowly compressed
b. partially burned flowers
c. burned flowers changed into fossils
d. changed into fossils
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.
