Coal

タイトルまたは説明

Coal is a black or brownish-black sedimentary rock that can be burned for fuel and used to generate electricity. Coal is the largest source of energy for generating electricity in the world. Coal is an abundant natural resource that can be used as a source of energy, as a chemical source from which numerous synthetic compounds (e.g., dyes, oils, waxes, pharmaceuticals, and  pesticides) can be derived, and in the production of coke for metallurgical processes.