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.
Anthracite is a hard, compact variety of coal that has a high luster. It has the highest carbon content, the fewest impurities, and the highest calorific content of all types of coal, which also include bituminous coal and lignite.nthracite is the most metamorphosed type of coal (but still represents low-grade metamorphism), in which the carbon content is between 92.1% and 98%.