The given picture illustrates the linear process of making ethanol fuel from corn.
Overall, the process can be divided into nine steps in total, with about 57 hours to complete the ending products, commencing with collecting corn from fields and culminating with delivering to gas stations by trucks.
At the first stage of the process, corn is harvested by farmers then stored in a barn. Next, crops are processed by many special machines. Firstly, the milling machine is used to turn the corn to flour which is cooked for four hours by hot water. In the next step, the flour corn mixture is fermented for 48 hours at a specific temperature.
The sixth stage involves separating the resulting mixture into liquid and solid products. After that, the liquid products are purified by a machine. Finally, the resulting gas will be stored in a truck for delivering to gas stations.