what is insecticides andpesticides?

how water pollutipon cause

What means asthma ?

But the water gets polluted also by sewage right ? That is my doubt .

 How are humans creating pollution in the enviroment?????????

 Hi Sreerao!!

the tolerate is 90 db

why can't we go to school by walking?

today is diwali november5,in india we are polluting everywhere.why?

can i download this

what is the tolerate noise level for humans

 do noise pollution mix on air

what is a pollution ?

 What is garbage?

can I GET SOME DIAGRAMS SHOWING OIL SPILLS

the video is not coming????