TH FOTO-WERBUNG / SCIENCE PHOTO LIBRARY TH FOTO-WERBUNG / SCIENCE PHOTO LIBRARY
Wind turbine. Used to generate electricity from wind, it is an important environmentally-friendly alternative to fossil fuel. Most turbines are designed to operate in windspeeds between 21 and 60 kilometres per hour. The blades have to be turned to face directly into the wind to work efficiently. Photographed at Oosterscheldedam, The Netherlands.
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