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Introduction to Water Pollution -freelance project Mobile App Promo Video " />

Introduction to Water Pollution



shawnturner : Introduction to Water Pollution



Hydrosphere covers more than 75 per-cent of the earth’s surface either as oceans (salt water) or as fresh water. Hydrosphere includes sea, rivers, oceans, lakes, ponds, streams etc.

Most of the earth’s surfaces water is in the oceans, which contains about 35 parts per thou­sand of dissolved salt of the remainder, most of fresh water with salt content of 0.2% of found either in lakes and ponds (still water) or in rivers and streams (running water).

Fresh water is also available in the form of rains, snow, dew etc. Hydrosphere covers ground water also. Evaporation of water from oceans, cloud formation and precipitation are responsible for worldwide water supply through hydrological cycles. Water is essential to all life. Life was first originate in water.

Pollution of water is the presence of some foreign organic, inorganic, biological, radiological or physical substances in the water. These substances contaminate water by degrading its quality which may cause health hazard or decrease the utility of water.

There are two principle sources of water, surface water and ground water. Surface water comes from streams, lakes, rivers, shallow wells and reservoirs created by damming. Most surface water contains suspended solids, organic and inorganic substances, microbes and other biota. If these substances are present in water in optimum level, they do not cause pollution.

On the contrary some of them are useful in improving the quality of water. When the concentration of these materials or organisms are high, they degrade the quality of water and make it unfit for recreational, domestic, industrial or other use.

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