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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.


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 greenish).

What is crude oil, and what is it used for? - University of Delaware

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 ...

Crude Oil Definition | Investopedia

Although it is often called "black gold," crude oil has ranging viscosity and can vary in color to various shades of black and yellow depending on its hydrocarbon  ...

What is Crude Oil? A Detailed Explanation on this Essential Fossil ...

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 ...

What is the difference between crude oil, petroleum products, and ...

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

What is crude oil? definition and meaning -

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

Crude Oil - How Oil Refining Works - Science - HowStuffWorks

Crude Oil - Despite the dangers, oil refineries are essential to society in its current form. Learn how crude oil is converted into everything from butane to gasoline.

Crude oil is the most important raw material of the industrialized nat ...

Crude oil is the most important natural resource of the industrialized nations. It can generate heat, drive machinery and fuel vehicles and airplanes.

Crude oil - School Science

The oil we find underground is called crude oil. Crude oil is a mixture of hydrocarbons - from almost solid to gaseous. These were produced when tiny plants and ...

Popular Q&A
Q: What is crude oil?
A: Crude oil is a liquid found in rock, containing mostly complex hydrocarbons, with additional organic material. Light oils are more valuable than heavy oils. Read More »
Q: What is crude oil?
A: Crude oil was made in the ground. When an animal or plant dies, then it will, of course, go in the ground. As many years pass, the dirt will pile up, and the pr... Read More »
Q: What is crude oil?
A: Crude oil is a naturally occurring, flammable liquid consisting of a complex mixture of hydrocarbons of various molecular weights, and other organic compounds. Read More »
Q: What is crude oil.
A: Petroleum or crude oil is a naturally occurring (unprocessed) flammable liquid found in rock Read More »
Q: What is crude oil?
A: An oil well produces predominantly crude oil, with some natural gas dissolved in it. Crude oil is the term for "unprocessed" oil, the stuff that comes out of th... Read More »