Coal is a solid, dark-colored rock rich in carbon and flammable gases found between layered sedimentary deposits. hard coal torque consists of the grass. Coal is mostly formed by the presence of other elements in varying amounts. Its main component is carbon; it also contains variable amounts of hydrogen, sulfur, oxygen and nitrogen. Coal, a fossil fuel burned for heat, provides about a quarter of the world's primary energy and two-fifths of its electricity. Some iron and steel producing enterprises and other industrial activities burn coal. The extraction and use of coal causes many premature deaths and a lot of illness. Thousands of people die early every year from Coal.