<span>Hydroelectric power is produced as water passes through a dam, and into a river below. The more water that passes through a dam, the more energy is produced. Once a dam is built, an artificial man-made lake is created behind the dam. Electricity is produced by a device called a turbine.
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Because many rivers run swiftly down int mountains.
Hope that helps
Maybe there's an app for that? Some kind of time lapse app? Or maybe set up a magnifying glass or a crystal ball on a stand and a piece of paper under it. As the sun passes, it will might burn a line on the page. As to how you would read this line, you would need some kind of measurement system - maybe do a baseline the day before and use you watch to record start and finish times.
Answer:
if this is any help...
Explanation:
Internal migration or domestic migration is human migration within one rural to urban areas, in a process described as urbanization, has also produced a form of internal migration .