The boy played football (past tense)
The boy plays football (present tense)
The boy will play football (future tense)
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.
14.D this is the best answer
As to number 13 I cannot answer because I don’t know anything about their interaction
Answer:
How does lime chloride produce a fibrous mass of cellulose?
Explanation:
UwU i asked my teacher