About Coal
Coal is a combustible black or brownish-black sedimentary rock composed primarily of carbon, along with varying amounts of other elements such as hydrogen, sulfur, oxygen, and nitrogen. It serves as a crucial commodity used primarily for electricity generation and industrial processes, such as steel production and cement manufacturing. Coal is mined from underground and surface mines worldwide and is classified based on its carbon content and calorific value into types like anthracite, bituminous, and lignite. Major producers include China, India, and the United States.