what is coal composed of how do humans use it
Split and merge into it. Answered by The Community. Making the world better, one answer at a time. Coal is mainly composed of carbon, oxygen and hydrogen. Humans use coal in the manufacturing of steel, in generating electricity, as a source of heat, as a liquid fuel and in the manufacturing of cement.ompanies use coal to generate electricity.   People use coal to heat their houses.   Steam trains use coal to power their engines.   Companies use coal and burn them â¦ to make hot air to spin their turbine to make energy.