How does the energy in crude oil become a fast-food snack? What changes does it go through along its journey? This book shows how the energy in crude oil is used to make a fast-food snack. It explains how crude oil was formed, how it is obtained and how it is used in the food industry. The book also looks at the science behind cooking and the effects of heat on food, the processes of packaging and preserving food, and finally how fast food is prepared.