Question

different anthropogenic activities have a negative impact on rivers justify your answer
give answers for class 7
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Answer 1

Answer:

Sulfur dioxide and nitrous oxide emitted from factories and power stations enter river systems through acid rain. Sewage and effluent are discharged into rivers in some areas. Pollution can lower the pH of the water, affecting all organisms from algae to vertebrates. Biodiversity decreases with decreasing pH.