Oil, also known as petroleum, is one of the most significant sources of energy in an energy-hungry world. Every day, more than 80 million barrels of oil are used in people's homes, businesses, and vehicles. This thorough book covers the important processes of this fossil fuel, from its origins and formation to its extraction and refining, aided by perfectly selected photographs. Readers will weigh in on the controversies surrounding oil's use as well as learn of its surprising applications--such as a medicine for ancient Egyptians and in materials that make our clothes.