A river's speed determines which species of plants and animals can live in it. Normally, the faster the river flows, the more oxygen it contains. But fast-flowing water is more difficult for some species to swim in.
A river may pass over several types of rock. Each rock type influences both water and species of animals and plants it can support. For example, the freshwater crayfish needs lots of oxygen and lime to build up its thick outer skeleton, a fast flowing river going over chalk is ideal. Man also influences river life . Some rivers are used by large industrial boats and have to be dredged deeply to maintain a deep channel, preventing natural development of the river bottom. Smaller boats require the removal of water plants, reducing habitat for wildlife. The wash from fast motor boats erodes the riverbanks, flooding nests and washing away wildlife.
Finally, population has great effect on river life. The most common types: sewage, chemicals and other waste from industry, oil, pesticides, litter, detergents, large amounts of hot water, animal waste and dense or decaying plant growth.
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3 comments:
Thanks 7aif for these information
As you know that the rivers are important source for human to get their food and so on....
We have to do something to stop the pollution of these palces
HLello
all elements in our gorund should be perfect becouse they have a big role to make our life easy
rivers are one of them , and if people do not protect them , they will disappeare and we will lose one of the most important element
There are many things that affect the life of the rivers.
Thanks 7aif for this subject that has more importence in this time.
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