Water Pollution
* Sources of water pollution can be divide into two types – point sources and non – point sources.
* Point sources are the easily identifiable sources of pollution, such as municipal and industrial discharge pipes.
* Non – point sources are not easily identifiable such as agricultural off from farms, acid rain and storm water drainage from streets and parking lots, etc.
* Pathogens are the most micro – organisms that cause diseases and are the most harmful of the causes of water pollution.
* Organic wastes are the biodegradable wastes caused by organic matter such as leaves and grass.
* Chemical pollutants include heavy metals, fertilisers, and pesticides and radioactive substances.
* The process of rapid plant growth in water and the depletion of oxygen, causing death to animals that results in a dis-functioning ecosystem, is called eutrophication.