• Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen.
  • Coal is an abundant natural resource that can be used as a source of energy, as a chemical source from which numerous synthetic compound (e.g., dyes, oils, waxes, pharmaceuticals, and pesticides) can be derived.
  • peat, lignite, bituminous, and anthracite are the types of coal