Causes Of Water Pollution
Water pollution is contamination of water bodies such as rivers, oceans, lakes, and groundwater caused by human activities. 1. Urbanisation As more and more people move into cities and towns, a number of factors cause pollution: • the physical disturbance of land due to construction of houses, industries, roads, etc.; • chemical pollution from industries, mines, etc.; • inadequate sewage collection and treatment; • Increase in fertilizers to grow more food. These results in an increase in nutrients (nitrates and phosphates) in the water which causes enhanced plant growth (algal blooms). When this plant material dies and decays the bacteria uses the oxygen in the water. This lowering of oxygen levels results in the death of other water life that needs oxygen to survive, eg. fish, etc. This process is called eutrophication; litter, which causes disease and has a negative visual impact. 2. Deforestation Clearing land for agriculture and urban growth often leads ...