These chemicals enter the lake through dumping by the factories. Temperature Changes: Temperature changes from waste heat discharges (like from a nuclear power plant) can cause pollution. This happens if their elevation reduces dissolved-oxygen levels, and accelerates eustrophication, which in turn affects the ecological processes and blocks the migration path of fishes. Acidification: Acidification (acid rain etc.) Is caused by sulfur and nitrogen oxide in the rain, which is caused by automobiles and large industries. Temperature Changes: The temperature of a body of water is changed by waste heat discharges, like that of a nuclear power plant. It affects ecological processes and blocks the migration paths of fish. Because of these pollutants Southern Saskatchewan and Alberta are threatened by water shortages, and the great lakes face problems in serious pollution. Rivers and streams are also greatly affected by these pollutants. The noticeable outcomes of these pollutants are these: Nitrates in drinking water can cause disease in infants that may sometimes end in death. Crops in a field can absorb sludge-derived fertilizer containing cadium, and when humans eat the crop it may result in acute liver and kidney damage. Sometimes lakes become artificially enriched with nutrients from the chemical fertilizers that run off cultivated fields into the water. This causes water that is unpleasant to drink due to bad odor, taste, and algae. Also, acid rain has left many lakes in Canada totally devoid of life. There are three major sources of water pollution, they are municipal, industrial and agricultural. Municipal: This type of water pollution comes from the wastewater found only in homes and commercial establishments For many years people have been placing importance on treating the waste to remove harmful bacteria, etc. from it. Recently we are coming aware of the fact that we have to improve the ways in which we dispose of the waste.
