Q.4:- Briefly explain (a) Air pollution, (b) Water pollution and (c) Land pollution.
(a) Air Pollution Air pollution is caused by a combination of factors which lowers the air quality. It is mainly due to carbon monoxide emitted by automobiles, smoke and other chemicals from manufacturing plants which are released in the air. Air pollution has created a hole in the ozone layer leading to dangerous warming of the Earth.
(b) Water Pollution Water pollution is caused by dumping of chemical, waste in water bodies like rivers, streams, etc. Water pollution has led to the death of several animals and posed a serious threat to human life.
(c) Land Pollution Land pollution is caused by the dumping of toxic wastes on land which damages the quality of land making it unfits for agriculture or plantation.