Category hierarchy can be separated into 5 categories namely.1. p. (Peat) is the first step in the process of coal occurred. Contains some plants that decomposed carcasses, but some of the plants, decomposed carcasses are not yet perceived as a distinct branch or the trunk is brown to black, with low carbon, approximately 50-60 per cent by mass. With oxygen and high humidity, but can be used as fuel.
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