Read,the following passage and answer the questions that follow :Man has altered many of the physical features of the earth with the tools of science. He has transformed woodlands and prairies into farmland. He has constructed lakes and dams to irrigate or to harness hydroelectric power. By cutting through mountain, he has almost modified the Very face of the earth.However his attemps to bring about change in the physical environment have not always been beneficial. Today pollution of the air and water endangers the health of our planet. The automobile exhausts and the smokes from the factories are affecting our health. Pollution from oil is killing marine life. The whole ecological balance of the sea is getting changed due to oil slick. Industrial and domestic wastes have choked several rivers. Conservationists strongly feel that if mankind and life were to survive on earth man must limit the growth of technology.1. What are the effects of pollution?2. How has man altered the earth?