Where crude oil is found
Petroleum is a naturally occurring, yellowish-black liquid found in geological formations Crude oil may also be found in a semi-solid form mixed with sand and water, as in the Athabasca oil sands in Canada, where it is usually referred to as Oil. Fossil Energy Study Guide: Oil. Petroleum—or crude oil—is a fossil fuel that is found in large quantities beneath the Earth's surface and is often used as a