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 fossils are typically preserved when they are buried under many layers of sand and mud. Given these facts, being preserved under many layers changes vegetation into peat through extreme what among the following options:
- Physical weathering
 - Wet weather
 - heat and mud
 - Time and energy
 - scarce resources
 - heat and pressure
 - heat and vegetation
 - sand and pressure


 

      heat and pressure   