DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Fermentation tanks (round, foreground) at a corn ethanol plant (round, foreground), Shenandoah, Iowa, USA. Corn storage silos can be seen in the background (round, right). Corn ethanol is a biofuel that is primarily used in the United States as an alternative to gasoline and petroleum. It is produced from corn through industrial fermentation, processing and distillation. The processing plant shown is operated by Green Plains Renewable Energy.
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