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ShareAcid rain is defined as any type of precipitation with a pH that is unusually low.
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Dissolved carbon dioxide dissociates to form weak carbonic acid giving a pH of approximately 5.6 at typical atmospheric concentrations of CO2.
There is a strong relationship between lower pH values and the loss of populations of fish in lakes.
Below 4.5 virtually no fish survive, whereas levels of 6 or higher promote healthy populations.
For more information about the topic Acid rain, read the full article at Wikipedia.org, or see the following related articles:
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