Coal is a hard rock which can be burned as a solid fossil fuel. It is a sedimentary rock formed from peat, by the pressure of rocks laid down later on top.
Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen.
The most significant uses of coal are in electricity generation, steel production, cement manufacturing and as a liquid fuel. Different types of coal have different uses. Steam coal – also known as thermal coal – is mainly used in power generation
