You are presented with the question "Buried vegetation in a wetland changes to peat over what?" and the following answer choices: 
- a long period of time
 - The area was once underwater
 - a brief period of time
 - just a day's time
 - Physical weathering
 - It used to be covered by water
 - movements in the earth's crust
 - a quick period of time

Now knowing 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, choose the best answer.


 

 a long period of time        