Explain briefly how a large quantity of dead organic materials dumped into a river can be harmful to aquatic life.
Dumping of refuse without a commensurate introduction of Oxygen to aid decomposition by aerobes calls for pollution of the river. This is because the carbon (|V) OXIde is increased coupled with the fact that the rate of decomposition is low. Aquatic organisms die as a result of this. The method of addition of measured quantity of oxygen when a given quantity of refuse is dumped at a given time in a river or sea termed B, O D (Bichemical Oxygen Demand)
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