INFORMATION

=INFORMATION=

These are the natural water resources of the Earth. These are found on the exterior of the Earth's crust, oceans, rivers and lakes.
 * Surface Water Pollution**

Considerable amount of Earth's water is found in soil or under rock structures called aquifers. People use aquifers to obtain drinking water and build wells to access it. In case this water becomes polluted, it is called groundwater pollution. This is caused by pesticide contamination from the soil and this can infect the drinking water and lead to huge problems.
 * Groundwater Pollution**

This is a natural form of water pollution caused by microorganisms. Most of these microorganims thrive in water and fish, land animals and humans to become ill. Microorganims like bacteria, viruses and protozoa cause serious diseases like cholera. In poor countries, there are no facilities to treat polluted water and hence the health of people are affected.
 * Microbiological Pollution**

Microorganisms that thrive in water feed on biodegradable substances. When a lot of biodegradable material is mixed with water, the number of microorganims increase and utilize the available oxygen. The is called oxygen depletion. As oxygen levels in water are depleted, harmless aerobic microorganisms die and anaerobic microorganims prosper. Some anaerobic microorganisms are harmful to people, environment and animals and they produce toxins like ammonia and sulfides.
 * Oxygen depletion Pollution**

These are necessary for plant growth and development. Most of these are found in wastewater and fertilizers. These can cause excess weed and algae growth if there are large concentrations in water. Drinking water and clog filters can be contaminated. The algae use up the oxygen in the water and leave none for the surrounding marine life and this can damage other aquatic organisms.
 * Nutrients**

As the molecules are very large to mix between the water molecules, some pollutants do not dissolve in water. This material is termed as particulate matter and can lead to water pollution. The suspended particles finally settle and form a thick silt at the bottom. The marine life on the floor of rivers and lakes are harmed. Biodegradable substances are suspended in water and raise the quantity of anaerobic microorganisms present. The toxic chemicals that are suspended in water are harmful to the development and survival of aquatic life.
 * Suspended Matter**

Agricultural and Industrial work has the use of many chemicals that can run-off into water and pollute it. Metals and solvents from industrial work pollute rivers and lakes. Aquatic life is endangered by these and made infertile. Pesticides are used to control weeds, insects and fungi. Run-off's of these pesticides poisons aquatic life. If birds, humans and other animals eat infected fish they may be poisoned. Petroleum is a different type of chemical pollutant that pollutes water by oil spills in case a ship ruptures. Oil spills have a localised affect on wildlife, but can spread for miles. This oil can effect the death of many fish and stick to the feathers of seabirds. This loses their ability to fly.
 * Chemical**

Pollution happens when silt and other suspended solids like soil, construction, washoff plowed fields enters river banks. Eutrophication occurs under natural conditions, lakes, rivers and other water bodies. This is an aging process that fills in the water body with sediment and organic matter. In case these sediments enter various water bodies, fish respiration is affected, plant productivity and water depth is decreased.