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POLLUTION  is defined as an unwanted change in the physical, chemical and biological characteristics of air, land and water.
Pollution are of mainly three types:
Soil pollution
Air pollution
Water pollution

SOIL POLLUTION: is caused by urban waste, industrial waste, biological agents, radioactive pollution.
AIR POLUTION: is caused by smoke from vehicles, combustion of coal and petroleum, thermal power plants.
WATER POLLUTION: is caused by waste effluents, industrial effluents, surface run-off, thermal pollution, radioactive wastes, marine pollution.

There may be Noise pollution also.
All kind of pollution have an adverse effect on human beings, plants and animals.
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thank you
i want a brief essay of abt 200 words
We are the  one who are polluting the world.
There are different types of pollution like :
And there are many more.

the water is being polluted by the harmful chemicals thrown by the factories and industries.this is causing a great threat to the life if the marine organisms.so we should not throw any sort of garbage in the water

the air is being polluted by the harmful dust and smoke given out by the vehicles.so it is better to use natural gases and not fuels.this is causing a lot of health problems.to avoid health problems we should not pollute the air.

the land is being polluted by the daily garbage thrown by us.this causes flood.the  throwing of garbages block the drains.so to stop floods we should not pollute the land.

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