Coal Is Divided Into Four Classes Lignite

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2019-10-4fuels may be divided into 4 classes iolid coke, coal, wood, charcoal, bagasse, lignite, cow dung, etciiquid diesel, petroleum and its derivatives, coal tar and its derivatives, shale oils, alcohol, etccoal is stratified carbonised remains of plant materialwo theories, known as the in situ theory and the drift theory.

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