Being burried under soil and mud changes vegetation into peat through extreme heat and pressure in a swamp over a long period of time.
Bogs are composed of peat.
Extreme heat and pressure in a swamp over a long period of time creates bogs.
What does extreme heat and pressure in a swamp over long periods of time create?

  * harm
  * soils
  * death
  * cracks
  * sweat
  * loss
  * Injury
  * bogs