Oil refinery storage tank. This tank contains products obtained from the refining and processing of crude oil. Crude oil is oil from the ground before it has been refined. It contains a varied mixture of hydrocarbons, and the refining process at an oil refinery separates it into parts called fractions. Fractions that are obtained from crude oil include bitumen, fuel oil, lubricating oils, diesel, jet fuel, petrol, and petroleum gases. The fractions are used as fuels, lubricants, and to make products such as plastics in the chemical industry. Photographed at ExxonMobil's Fawley Oil Refinery and Chemical Plant, Hampshire, UK, one of the largest petrochemical plants in Europe, and the largest oil refinery in the UK.