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

Fact 2: After a long time, the moss can form into a peat.

Given the two facts above, answer the question "What is transformed through extreme heat and pressure over time?" with the following options: 
- corn
 - coal
 - Gases
 - moss
 - potash
 - oil
 - matter
 - energy


 

    moss     