Coal is a type of sedimentary rock that is caused by the accumulation of sedimentation in the primitive age as several million years long. Until the transition to sludge and has most of the elements are the elements carbon and other elements with both gas and liquid contamination is in proportion to less fuel and is able to ignite. There is a light brown till black and oily skin types is both the lightest coal contains significant elements carbon, hydrogen, nitrogen, and four, including oxygen. In addition, there are other substances such as sulphur, elemental, or mix a little. There are a number of high-carbon coal, and the other is low when taken give much heat Burns will be regarded as of high quality coal.
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