'Oil or petroleum, it is also called crude oil, is a thick liquid, flammable, dark brown or greenish, found in the upper layer of the earth's crust. The oil consists of complex mixture of الهيدروكربورات in, especially precious chain alkanes chemically, but differs in appearance and composition and purity strongly from one place to another. It is a source of primary energy sources is very important energy statistics in the world, but the world burn and exploited to run cars and enjoy the luxury of movement in the production of electric power that can be generated in other ways to provide this gold burning human black chemically values. Oil is a raw material for many chemical products, including fertilizers, pesticides, plastics and many of the tools and chips plastic tubes and nylon fabrics, artificial silk and synthetic leather and medicines.


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