Eutrophication and Acid Rain as Nutrient-Cycle Disruptions
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Eutrophication is nutrient runoff, per Bio 3663, fueling algal blooms whose decomposition depletes dissolved oxygen; acid rain is acidified precipitation disrupting soil and water nutrient chemistry.
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Fertilizer runoff into a lake triggers a bloom whose die-off and decomposition consumes the oxygen fish need.
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Eutrophication kills aquatic life through oxygen depletion after the bloom decomposes, not through algae itself being toxic.
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