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Macroscopic pollution often called "floatables" is usally caused by large objects found in the water, such as marine debris or even shipwrecks and trash from runoff. Examples include coolants released by power plants or by urban runoff. In the previous answers the four causes are pathogens.

Pathogens are microorganisms that can cause and spread diseases. An example for this would be eutrophication. When we use fertilizers and other substances on farmlands some of the chemicals contaminate nearby water sources through run-off.

This causes the phytoplankton in the water to grow rapidly and this leads to algal bloom. Algal bloom is not good as it uses up all of the oxygen that is needed by the flora and fauna of the water. It blocks the sunlight that might be needed for some photosynthetic plants and organisms. The algae might even produce toxins that are very harmful and can affect any animal that feeds on them. So that is one way the water can be polluted and dangerous for consumption. Organic compounds that pollute the water include detergents, pesticides, fuels, and some types of industrial wastes organic.

Inorganic compunds would include industrial inorganic wastes like sulphur dioxide which is emitted from industries. By-products of industrial procedures fall in this category too. As the river flows downstream, it gains more water from other streams, rivers, springs, added rainfall, and other water sources.

Rivers flow in channels. The bottom of the channel is called the bed and the sides of the channel are called the banks. Where do rivers begin? Rivers begin at their source in higher ground such as mountains or hills, where rain water or melting snow collects and forms tiny streams.

When one stream meets another and they merge together, the smaller stream is known as a tributary. It takes many tributary streams to form a river. The great majority of rivers eventually flow into a larger body of water, like an ocean, sea, or large lake. The end of the river is called the mouth. Most settlements were built along major rivers. Rivers provide us with food, energy, recreation, transportation routes, and of course water for irrigation and for drinking. Follow me on Twitter mbarrow.

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Primary Homework Help. Rivers. by Mandy Barrow: This site uses cookies. Effects of pollution. Pollution kills water plants and animals. Efforts are being made to clean dirty rivers. Water companies like Southern Water are spending a lot of money to clean up dirty rivers. There are fines for companies and people who deliberately throw.

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River pollution primary homework help. The River Thames is the cleanest river in homework world help flows through a major city. This is writing service specification major feat river that fifty years ago the river was so polluted pollution it was declared biologically dead. law and order in pakistan essay Primary Homework Help River Pollution essay on medical marijuana ucl phd thesis abstract/10().

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Primary homework help river pollution. Rivers look unsightly when there is rubbish in them. Polluted rivers smell bad. Solutions Efforts are being made to clean dirty rivers. South Africa. Recent Posts. The River Thames is the cleanest river in the world that flows through a major city. This is a major feat considering that fifty years ago the. As the river flows downstream, it gains more water from other streams, rivers, springs, added rainfall, and other water sources. What is a river? A river is freshwater flowing across the surface of the land, usually to the sea.