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Hydro electricity comes from two main power sources: the sun and gravity. The sun heats water and it becomes water vapor. The vapor rises and later precipiates at the source of a river or stream. Gravity pulls the water downwards along a riverbed. A hydroelectric power plant uses a wheel which turns as water travels past. The turning motion spins a turbine which powers a generator. Thus electricity is created

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Q: Where did hydroelectricity come from?
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