Spontaneous combustion is characterized as the natural starting of a fire in a coal seam. The 200°C temperature required for the spontaneous combustion comes from the oxidation of pyrite and resins in the coal.
Ref: 122719/2006-09-24

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Comb (Comb bind means to plastic comb bind by inserting ...)
combustion (Combustion is the burning of a material, i.e., a ...)

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