by 
sleidman
ANSWERS: 4
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Rivers and lakes get flooded up stream, down stream wetlands dry out, fish spawning grounds may be lost, fish and bird habitat is ruined. Seasonal variations and extremes may affect power supply, which is then supplemented with oil or coal fired generation. These are a few that pop to mind.
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yes it is hard to write an asignment about it
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It uses more electricity to pump the water up the hill than it creates as the water falls. It's advantage is that it is a way of storing electricity which can be released when needed
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No.
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