Cambridge 19 Test 3 Writing Task 1 (Biofuel production: how ethanol is made)

The graphic information illustrates the production of a biofuel called ethanol. This essay will describe the step-by-step process from harvesting the raw materials to distribution to different vehicles. Overall, there are 5 steps to complete the whole cycle.

First, plants and trees grow and produce energy from sunlight and carbon dioxide. The raw materials such as plants and trees are harvested. Then, the harvested plants are pre-processed using a machine called grinder. The grinder will break down the plants into smaller pieces. After this, the processed materials are now called cellulose. These cellulose will go through another process where it would be broken down into sugars. Microbes will finally be mixed into the sugars and the biofuel called ethanol will be produced. The ethanol will then be used or distributed to various modes of transportation such as cars, trucks, and airplanes which will emit carbon dioxide for plants to use again.

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