Question

Complete the following dialogues by writing at least two sentences i. A: Excuse me, could you direct me to the office of the Principal?

Answer 1

Pollution is the fouling of the environment – land, water, and air – by waste, smoke, chemicals and other harmful substances. The most serious pollution occurs where there are large cities and many factories. Every industrial country faces the problem of waste. As factories produce new goods for people to buy, old ones are thrown out with the household rubbish. Burning this refuse pollutes the air, dumping it in rivers and seas pollutes the water, and rubbish tips are unpleasant sights and take up much needed space. Getting rid of plastics is particularly difficult. Wood and paper decay after some time through the action of bacteria. But plastics never decay. The more we throw away, the more litter is produced.
The world’s oceans have been used as ‘dustbins’, with millions of tonnes of rubbish being dumped into the sea every year, harming marine life. If too much untreated sewage is poured into seas, lakes, and rivers from sewers, the water can no longer dilute it. All the oxygen in the water is used up, and the fish die. The bacteria which normally break down the sewage into harmless substances also die, only harmful bacteria which do not need air remain, and these cause disease.
Smoke from factory chimneys and exhaust gases from motor vehicles pollute the air. Chemicals in the air combine with moisture to make acids which eat away stone and brick, and so damage buildings. Carbon monoxide gas and substances called hydrocarbons given out by the engines of cars, lorries, and buses can damage people’s health. Ridding our world of pollution is an unimaginably big task.