2019-6-9 · 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.. References