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Space Shuttle
Grade 6
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Sources of Energy

Wind is a type of solar . It is created by the uneven of Earth’s surface by the Sun. Windmills have been used on farms to pump and grind grain. Some remote areas also used wind-powered . The need for these lessened when electric companies strung across America. On wind farms, wind is converted into electricity using large wind . The energy of falling water can be harnessed to turn a wheel. Flowing water is used to generate electricity in a process called . This method causes little and is readily available. However, building large can damage the environment.