You are presented with the quiz "what has its soil and mud changed by extreme heat over long periods of 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 "bogs are characterized by cushion-like vegetation and an accumulation of peat". 

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


 

  bogs         