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Mineral oils, found in porous rocks underground, originated from organic material, such as dead plankton, accumulated on the seafloor in geologically ancient times. Through various geochemical processes this material was converted to mineral oil, or petroleum, and such. These are classified as mineral oils because they do not have an organic origin on human timescales, and are instead derived from underground geologic locations such as in rocks, underground traps, or sands.
Other oily substances can also be found in the environment; the most well-known of those is asphalt, occurring naturally underground or, where there are leaks, in tar pits.
Petroleum and other mineral oils (specifically labeled as petrochemicals) have become crucial resources to human civilization. In modern times, they are often referred to by the term of "oil" itself.