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Petroleum is a substance that occurs naturally in a yellowish-black form. It is found in a liquid form in the geological formations underneath the Earth's surface. It includes all solid, liquid and gaseous hydrocarbons as well as crude oil.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.