Definition of coal

Coal is also called coal. Coal derived from plants were buried by sediment marsh land a long time ago (millions of years ago). Because of its location on the earth, making coal mining manner, namely by creating tunnels in the ground. Workers should go down with the elevator up to hundreds of meters into the ground. Coal can be processed into artificial fibers, nylon, dyes, ammonia gas, camphor wood, glue, wood preservatives, paints, and so on. Coal is also used as fuel to drive electricity generators. Coal can also be made into synthetic rubber, plastics, gases, and explosives.