Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. ... Coal is a type of fossil fuel, formed when dead ...
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Coal is a hard rock which can be burned as a fossil fuel. It is mostly carbon but also contains hydrogen, sulphur, oxygen and nitrogen.
Anthracite, also known as hard coal and black coal, is a hard, compact variety of coal that has a submetallic lustre. It has the highest carbon content, ...
Lignite often referred to as brown coal, is a soft, brown, combustible sedimentary rock formed from naturally compressed peat. It has a carbon content ...