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Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal mines produce coal.  They require volumes of lumber to maintain their shafts. Despite many alternatives uncovered with the passage of time, coal is still very useful as an energy source - if you know where to find it in sufficient volumes. Greatly affected by fossils that are location specific and formed by organic death and gravity over time. Coal mining speed can be enhanced by improved technology