Water Pollution

                    Human activities are the main reason why water pollution in most countries has reached a critical point. Waste matter from industrial and domestic sources that is dissolve or suspended in water contributes to the deterioration of water quality.
                   
                    In Malaysia, we also has a water pollution which is one of the bad pollution after air pollution. We have discussed how run-offs of fertilisers into lakes and rivers affect the freshwater ecosystems through eutrophication. Eutrophication occurs when inorganic nutrients and organic material enter a river or a lake. The discharge of untreated sewage into a river also has an immediate effect on the biotic and abiotic components of the water ecosystem.
                   
                    The enrichment of lakes and rivers with nutrients encourages photosynthesising organisms in the water, particularly algae, to grow rapidly, resulting in a population explosion known as an algal bloom. The density of the algae may be so high that light intensity in the water is greatly reduced. The death of plants and algae and the subsequent decomposition of these organisms by bacteria lead to a serve depletion of oxygen in the water, causing the death of aerobic organisms.


                                                                             

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