Crude oil is a dark, thick hydrocarbon liquid found deep underground in land or sea formed from the dead remains of microorganisms called plankton that lived millions of years ago.

The fuel necessary for motor vehicles and aviation and many other common products like plastic, paints, detergents, fertilizers, lubricants in daily use are derived from oil!!!

Crude oil is termed sweet and sour according to the content of sulphur present in it.

Crude oil is "sweet" if it contains less sulphur and "sour" if it contains more sulphur.

Light Crude oil flows freely like water and heavy crude oil is thick and sticky like tar.

Oil is measured in barrels "bbl". One standard barrel is 159 liters or 42 Us gallons.