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Petroleum, or crude oil, is a smelly, yellow-to-black liquid and is usually found in underground areas called reservoirs.
Oil was formed from the remains of animals and plants (diatoms) that lived millions of years ago in a marine (water) environment before the dinosaurs.

en.wikipedia.org/wiki/Petroleum

Petroleum is a naturally occurring, yellow-to-black liquid found in geological formations ..... Crude oil varies greatly in appearance depending on its composition. It is usually black or dark brown (although it may be yellowish, reddish, or even ...

www.investopedia.com/terms/c/crude-oil.asp

Crude oil is a naturally occurring, unrefined petroleum product composed of hydrocarbon deposits and other organic materials.

oilprice.com/Energy/Crude-Oil/What-Is-Crude-Oil-A-Detailed-Explanation-On-This-Essential-Fossil-Fuel.html

Jul 24, 2009 ... Learn about crude oil, it's makeup, Oil production, and how we use it (beyond the standard fuels, such as gasoline.) Crude Oil is essential to our ...

www.businessdictionary.com/definition/crude-oil.html

Definition of crude oil: Mixture of naturally occurring hydrocarbons that is refined into diesel, gasoline, heating oil, jet fuel, kerosene, and literally thousands of ...

www.ceoe.udel.edu/oilspill/crudeoil.html

Crude oil is pumped from the ground in the Middle East (e.g., Saudi Arabian Arab Light), West Africa (e.g., Nigerian Bonny Light), the Americas, and Asia ...

www.eia.gov/tools/faqs/faq.php?id=40&t=6

Petroleum products are produced from the processing of crude oil and other liquids at petroleum refineries, from the extraction of liquid hydrocarbons at natural ...

www.eia.gov/EnergyExplained/index.cfm?page=oil_home

Crude oil is a mixture of hydrocarbons that formed from plants and animals that lived millions of years ago. Crude oil is a fossil fuel, and it exists in liquid form in ...

science.howstuffworks.com/environmental/energy/oil-refining1.htm

Crude oil is the term for "unprocessed" oil, the stuff that comes out of the ground. It is also known as petroleum. Crude oil is a fossil fuel, meaning that it was ...

www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway_pre_2011/carbon_chem/4_crude_oil1.shtml

A secondary school revision resource for OCR GCSE Science about carbon chemistry and making crude oil useful.