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Answer. In nature, carbonisation has been occurring since the very beginning of the formation of life on this planet. Living organisms die after some time and are destroyed into particles with the help of microorganisms.
But when the dead bodies go down under the earth’s crust, they fall under immense pressure as well as heat. These physical changes induced chemical deformations or changes in those dead vegetation. Due to this phenomenon, vegetation gradually starts becoming carbon molecules or coal to be precise.
Without any doubt, the main constituent of coal is carbon. However, the coal becomes after the carbonisation procedure and its source is natural vegetation. Thus, coal is considered as organic fuel.
