The world's oceans are so vast that they can cope with the present levels of pollution. However, little is known about the long-term effects of such slow poisoning. The most serious problem of modern time is that man is destroying the earth's natural resources and transforming huge areas into waste land. As a result, it is becoming extremely difficult to grow enough to feed the world's rapidly increasing population. A way of protecting all wild life on the earth must also be found as many species are in danger of disappearing completely from the face of the earth. The smoke in the atmosphere, for example, is increasing so much that the amount of sunlight has been reduced in many cities. Man's whole environment is being changed in a serious way. 1) What is the process of making something dirty ? ........................................................................................................................................................ 2) Find a word or phrase from the passage with the same meaning as the air, water and land in which we live? ....................................................................................................................................................... 3) What is the air surrounding the earth called? ........................................................................................................................................................ 4) What could be best replaced wealth, goods or products people can use ? ......................................................................................................................................................... 5) What is a difficulty which needs attention and thought ? ........................................................................................................................................