Petroleum (L. petroleum, frae Greek: πέτρα (rock) + Laitin: oleum (ile)) is a naiturally occurrin, yellae-tae-black liquid foond in geologic formations beneath the Yird's surface, which is commonly refined intae various types o fuels. It consists o hydrocarbons o various molecular wichts an ither liquid organic compoonds.
- "Petroleum". Concise Oxford English Dictionary
- The Laitin wird petra is a loanword frae Greek πέτρα.
- "Gasoline as Fuel – History of Word Gasoline – Gasoline and Petroleum Origins". Alternativefuels.about.com. 2013-07-12. Retrieved 2013-08-27.
- EIA Energy Kids - Oil (petroleum). Eia.gov. Retrieved on 2013-11-26.