Crude oil
Oil or crude oil is a thick and inflammable liquid with a burnt brown or dark green or black color, which is found in the upper layers of parts of the earth’s crust. Oil contains a complex mixture of various hydrocarbons.
Most of these hydrocarbons are from the alkane chain; But they may have many differences in terms of composition or purity. Oil is called black gold. Oil is one of the fossil fuels and is non-renewable. Heavy oil has a high viscosity.