Crude oil

Definition

Crude oil refers to a fossil fuel that is formed from the remains of ancient marine organisms. It is a thick, dark liquid composed mainly of hydrocarbons.

Related terms

Non-renewable energy:

Energy derived from sources that cannot be replenished in a short period, like crude oil.

Tar sands: Also known as oil sands, tar sands are deposits of sand or clay mixed with water and bitumen (a thick form of petroleum). They require extensive processing to extract usable oil.

Fossil fuels: A general term for non-renewable energy sources such as coal, natural gas, and crude oil.