Petroleum - Wikipedia
2019-6-23 · Petroleum (/ p ə ˈ t r oʊ l i ə m /) is a naturally occurring, yellowish-black liquid found in geological formations beneath the Earth's surface. It is commonly refined into various types of fuels.Components of petroleum are separated using a technique called fractional distillation, i.e. separation of a liquid mixture into fractions differing in boiling point by means of distillation ...