Coal seem me methane gas khi-khi gas pocket ke roop me jab pressure ke saath dabbi rahti hai, or jab koyla ko katt-te--katt-te, waha ka layer patla kar dete hai, tab wah gas pressure ke kaaran patle layer wale koyle ko todte hue baahar aa jati hai, jissee hmm Outburst kahte hai.
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