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1/The process of making something dirty is pollution 

2/A word or phrase with the same meaning as the air , water and land we live is evirorment

3/The air surrounding the earth is called atmosphere

4/Resources could be best replaced wealth , goods or products people can use 

5/A difficulty which needs attention and thought is problem

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 times is that the man is destroying the earth's natural resources and transforming huge area into wasteland. As a result, it is becoming extremely difficult to grow enough to feed the world rapidly increasing population. A way of protecting all the wildlife on the earth must also be found as many species are in danger of disappearance complete from the face of the earth. The dangers, however, are not confined solely for the land and the sea. The smoke in the atmosphere, for example, is increasing so much that the amount of sunlight have been reduced in many cities. Man's whole environment is being changed in a serious way

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