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. Given these facts, where does being buried under soil and mud change peat into coal through extreme heat and pressure over a long period of time among the following options:
- watershed
 - alluvial
 - wetland
 - deltas
 - erosion
 - houses
 - earth
 - lakes


 

   wetland      