pollution is the introduction of contaminants into natural environment that causes adverse changes....

mainly there are 4 types of pollution...

air pollution , water pollution , noise pollution and soil / land pollution....

1 = Air Pollution - it is caused by using harmful gases in industries or factories... secondally it is caused by smoke coming out from vehicles , etc... air pollution is the contamination of air....

2 = Water Pollution - water pollution is the contamination of water.... it is mainly caused by us (human beings)... we are too careless and never think about the future... there is only 2.7% of fresh water on the earth and we are using it as i'll never get finish..... it is caused by harmful materials in water thrown by industrial people , etc...some people take their clothes near by the rivers and use detergents , and detergents makes the river water conaminated....

3= Noise Pollution - it is unnecesary sound in ecosystem.... it is caused by harmful noise in environment which is caused by loud d.j's , speakers , cars horns , etc...it can cause differnt types of ear problems to differnt aged people....

4= Land / Soil Pollution - it is the contamination of soil caused by harmful fertilizers used by farmers , dumping of untreated wastes , etc....