You are presented with the question "Being buried under soil and mud changes what into coal in wetlands over time?" and the following answer choices: 
- peat
 - phytoplankton
 - fields
 - oil
 - air
 - pH
 - sunlight
 - elms

Now knowing that being burried under soil and mud changes peat into coal through extreme heat and pressure in a swamp over a long period of time and well, a swamp is a type of wetland, choose the best answer.


 

 peat        