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Hi MJM, a few more questions ...I have been reading about these underground coal seams that are burning, some for a long time ? so where does the oxygen come from to keep it burning and why dosen't the smoke extinguish it ?? Also the council has been cutting the grass and leaving the cuttings on top...I have collected these in the past and have noticed that once in a heap they get really very hot inside ...can one explain exactly how this occurs ..please thanks Willy