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Oil is a natural oily combustible liquid with specific odor, consisting mainly of a complex mixture of hydrocarbons of various molecular weights and some other chemical compounds. Refers to the kaustobiolitam (fossil fuels).The vast majority of the oil is confined to the sedimentary rocks. Oil color varies in Brown-Brown (from dirty-yellow to dark-brown, almost black), sometimes it is purely black, occasionally there is oil painted in bright yellow-green color, and even colorless, as well as deep-green oil. Has a specific smell, also var′iruûŝij from an easy pleasant to heavy and very unpleasant. The color and smell of oil are largely due to the presence of nitrogen-, sulfur-and oxygen-containing components, which are concentrated in the lubricating oil and the oil balance. Most petroleum hydrocarbons (except aroma) in pure form devoid of smell and color.Throughout the 20th century and into the twenty-first century oil is one of the most important mineral for mankind.Chemical composition and origin of oil close to natural gas fuel and ozokeritu. These minerals combine under the name petrolity. Petrolity belongs to the more extensive group of so-called caustobioliths-combustible minerals biogenic origin, which also includes other iskopaemy
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