Potential omission in the first paragraph - last sentance

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A fossil fuel, petroleum is formed when large quantities of dead organisms, mostly zooplankton and algae, are buried underneath sedimentary rock under anoxic conditions and subjected to both intense heat and pressure.

https://uwaterloo.ca/wat-on-earth/news/Cite error: A <ref> tag is missing the closing </ref> (see the help page).formation-oil-and-other-elements-required-produce-petroleum[1]Cite error: A <ref> tag is missing the closing </ref> (see the help page).formation-oil-and-other-elements-required-produce-petroleum[1] |website=University of Waterloo |publisher=University of Waterloo |access-date=2 September 2021}}</ref>

References

  1. ^ a b Cite error: The named reference undefined was invoked but never defined (see the help page).

removed US-centric order in history section

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Someone thought it would be important that the first oil well was drilled in the US in 1859 (when you only count machine drills!) Wikipedia is not about national pride. I applied chronological order and removed that Guiness Book style remark. 2A01:C22:35F9:8100:3021:F59A:5898:47D0 (talk) 00:41, 15 June 2024 (UTC)Reply

Petroleum comes in many colors

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Oil is not always "yellowish-black liquid". Different oil fields have different colours, ranging from black to green. I can attach a photo from a Geological Museum that includes _some_ of these colors. Shygeek12 (talk) 09:51, 7 July 2024 (UTC)Reply

Inaccuracy: All Pharmaceuticals Derived from Petroleum

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The article claims that all pharmaceuticals are derived from petroleum, which is inaccurate and lacks supporting evidence. While petroleum-based chemicals are essential in many synthetic drug processes, numerous medications originate from natural sources or are produced through biotechnology, independent of petroleum. 2A02:C7C:DEF0:3C00:D9C0:E596:5299:19E3 (talk) 15:40, 26 July 2024 (UTC)Reply

No, it doesn't say that William M. Connolley (talk) 17:45, 26 July 2024 (UTC)Reply