to human society. As the mixture of organic chemicals. It play a role as blood to industries. And in daily life we are even more relying on petroleum and its products. The running car, plastic we use and the asphalt road we drive on and so on. But what is petroleum? why is it so important?
one of the most important product of petroleum is plastic. Nowadays plastic is the most common material in daily due to their relatively low cost, ease of manufacture, versatility, and imperviousness to water. They have already displaced many traditional materials, such as wood, stone, horn and bone, leather, paper, metal, glass, and ceramic, in most of their former uses. 
Second one is fuel. This is the blood for modern society. 
Most common petroleum's fuel product are gasoline, kerosene, heavy crude oil and diesel. Most of vehicles burn gasoline in order to run. Airplanes needs jet fuel. some power plants use petroleum to produce electricity in some area. As the world is globalized. The demand of fuel is getting stronger and stronger. Our environment also face a great danger due to greenhouse gases. But till now we don't have any other resources that can replace petroleum.
Petroleum is the mixture mainly consists various kinds of Alkanes; Naphthalene and Aromatic Hydrocarbon. In smaller view It mainly constitute by carbon and hydrogen. Around 83%~87% is carbon, 10 %~14% hydrogen there are also Oxygen, nitrogen and sulfur but the content is less than 1%. It is oily liquid Which is usually dark brown, brownish black, blackish green and sometime transparent. The formation of petroleum requires at least 2 million years. It also requires a suitable environment for ancient organic materials, such as zooplankton and algae to form petroleum.
Petroleum is a amazing mixture of chemicals indeed.
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