Coal

Coal is a hard rock which can be burned as a solid fossil fuel. It is mostly carbon but also contains hydrogen, sulphur, oxygen and nitrogen. It is a sedimentary rock formed from peat, by the pressure of rocks laid down later on top.How coal is formed Coal formed: millions of years ago when the earth was covered with huge swampy forests where plants – giant ferns, reeds and mosses – grew. … Heat and pressure produced chemical and physical changes in the plant layers which forced out oxygen and left rich carbon deposits.  uses for coal : he most significant uses of coal are in electricity generation, steel production, cement manufacturing and as a liquid fuel. Steam coal – also known as thermal coal – is mainly used in power generation. Coking coal – also known as metallurgical coal – is mainly used in steel production.

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