Question

define water pollution List any three anthropogenic source of water pollution

Answer 1

Water pollution is the contamination of water bodies (e.g. lakes, rivers, oceans, aquifers and groundwater). This form of environmental degradation occurs when pollutants are directly or indirectly discharged into water bodies without adequate treatment to remove harmful compounds.
Water pollution is caused by the discharge of untreated chemical waste like dyes,detergents,acids,heavy metals ,pesticides , fertilisers ,and plastics from industries, into fresh water bodies like rivers and lakes.
It is also causing various diseases like diarohea, etc. which are a great threat to human health.
It is also causing problems to various marine organisms and is even responsible for their death.
Due to water pollution, we have no option other than to eat poisonous crops as pure water is not available to everyone for watering purpose

Answer 2

Water pollution is any chemical, physical or biological change in the quality of water that has a harmful effect on any living thing that drinks or uses or lives (in) it. When humans drink polluted water it often has serious effects on their health. Water pollution can also make water unsuited for the desired use.
these are some anthropogenic actions which cause water pollution
1.Agriculture runoff - carrying fertilizers, pesticides/insecticides/herbicides and other pollutants into water bodies such as lakes, rivers, ponds). The usual effect of this type of pollution consists of algae growing in affected water bodies. This is a sign of increased nitrates and phosphates in water that could be harmful to human health.
2.Storm water runoff – carrying various oils, petroleum products, and other contaminants from urban and rural areas (ditches). These usually forms sheens on the water surface.
3.Mining activities – mining activities involve crushing rocks that usually contain many trace metals and sulfides. The leftover material from mining activities may easily generate sulfuric acid in the presence of precipitation water.
4.Burning of fossil fuels – the emitted ash particles usually contain toxic metals (such as As or Pb). Burning will also add a series of oxides including carbon dioxide to air and, respectively, water bodies
5.Leaking sewer lines – may add trihalomethanes (such as chloroform) as well as other contaminants into groundwater ending up contaminating surface water, too. Discharges of chlorinated solvents from dry-cleaners to sewer lines are also a recognized source of water pollution with these persistent and harmful solvents.