During coal formation, sediment and rock pile on top after plants die and fall to the bottom of a swamp.
A Coal formation may be defined as a process through which dead plant matter disintegrates into peat and is converted into coal by the heat and pressure of deep burial over millions of years.
When a plant dies and falls to the bottom of the swamp various sediments and rocks pile on top over millions of years. It converts the organic form of the plants to inorganic ones and the synthesis of coal occurs.
Therefore, during coal formation, sediment and rock pile on top after plants die and fall to the bottom of a swamp.
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