You are presented with the quiz "Buried vegetation in a wetland changes to peat over what?" 

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 "wetlands Wetlands are also called swamps or marshes". 

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


 

 a long period of time          