Petroleum is a viscous, dark brown liquid called "the blood of industry". There are oil storages in parts of the upper crust. The main component is a mixture of various alkanes, cycloalkanes and aromatic hydrocarbons. The oil-forming mechanism of petroleum has two theories: biological sedimentation to oil and petrochemical oil. The former is more widely accepted. It is believed that oil is formed by organisms in ancient oceans or lakes after a long evolution, and belongs to biological sedimentation to oil and cannot be regenerated; the latter It is believed that oil is generated from the carbon in the earth's crust, has nothing to do with living things, and is renewable.
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