sentences: being buried under soil and mud changes dead vegetation / dead plant matter into peat through extreme heat and pressure in a swamp over a long period of time
docs: dead_tree is organic_matter. peat is organic_matter. mud is soil. dead_tree_branch is organic_matter. dead_space is concealment_providing_terrain. dead_space is cover_providing_terrain. peat_dried is plant_material. wood is dead_trees. burying_alive is burying. burying is covering.