Fact 1: Being burried under soil and mud changes peat into coal through extreme heat and pressure in a swamp over a long period of time.

Fact 2: Peat moss is the organic matter that mixes with soil to form peat.

Given the two facts above, answer the question "what being buried under mud changes peat into coal?" with the following options: 
- a hydraulic system
 - space matter
 - mud shoes
 - Water expanding
 - Physical weathering
 - organic matter
 - flow of electrons
 - insignificant matter


 

      organic matter   