The project manager for the development of the Physical Setting/Earth Science Core Curriculum was Elise Russo, Associate in Science Education, with content and assessment support provided by Sharon Miller, Associate in. Educational Testing. Diana K. Harding, Associate in Science Education, provided additional support.
Coal (from the Old English term col, which has meant mineral of fossilized carbon since the 13th century) is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams.
Carbon is the main component of coal, which also contains varying amounts of other components, like hydrogen, oxygen, sulphur and other impurities. Main parameters used to define coal are calorific value, ash, moisture and sulphur.