Fossil energy

Fuel: substance capable of burning, ie rapidly combine with oxygen with an exotherm more or less high.  Are characterized by being constituted by a mixture of few elements: carbon, hydrogen and sulfur. Fossil fuels come from living things fermented residues that were buried during the era of the great cataclysms.
 

Coal
 Its main constituent is carbon, together with oxygen and hydrogen, and minor amounts of sulfur and nitrogen. It is used in different sectors including electricity generation, the production of iron and steel etc. Coal plays a vital role in power generation.


Oil 
Oil is a complex mixture of hydrocarbons.It is present in our daily lives, as fuel for transport. We must bear in mind that this raw material provides a large amount of products we use so indispensable automotive components, plastics, utensils various ... 


Natural gas
The quintessential gaseous fuel is natural gas. It is a nontoxic compound, colorless, odorless, comprising a mixture of hydrocarbons in which the main component is methane. But its chemical composition varies widely by source, since usually be associated with other molecules or elements, such as hydrogen sulfide, carbon dioxide, nitrogen and helium, extract is necessary for industrial use.