You are presented with the question "How is coal made?" and the following answer choices: 
- Being exposed to air
 - to move people
 - Converting waste.
 - heat is produced
 - It gets heated up
 - Being buried under ground
 - By hand
 - In a factory

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 most coal is fossil peat, choose the best answer.


 

      Being buried under ground   