You are presented with the quiz "What is transformed through extreme heat and pressure over time?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "being burried under soil and mud changes vegetation into peat through extreme heat and pressure in a swamp over a long period of time" and "after a long time, the moss can form into a peat". 

So, what's the best answer to the question?


 

    moss       