1) acid rain a) poisonous gas b) it contains large amounts of harmful chemicals as a result of burning substances such as coal and oil c) animals and plans which may soon not exist . 2) biodegradabable a) it decays naturally b) it can be produced as quickly as it is used c) an article that is intended to be thrown away after use 3) oil spill a) a gradual increase in world temperatures b) the cutting down of tress in a large area c) An accident causes it to escape from a ship or container 4) carbon monoxide a) poisonous gas b) unwanted matter or material of any kind c) strong, unpleasant dangerous gas 5) natural resources a) damage caused to water, air or soil by harmful substances b) things such as minerals, forests etc which exist in a place and can be used by people c) number and variety of plant and animal species in a particular area. 6) deforestation a) general weather conditions usu. found in a particular place b) the process by which land changes into desert c) the cutting down of trees in a large area. 7) ozone layer a) a gradual increase in world temperatures b) it prevents harmful ultraviolet light from the sun from reaching the Earth c) damage caused by water, air or soil by harmful substances 8) global warming a) the process by which land changes into desert b) it contains large amounts of harmful chemicals c) a gradual increase in world temperatures caused by polluted gases 9) pollution a) damage caused to water, air or soil by harmful substances or waste b) strong unpleasant and sometimes dangerous gas, smoke c) general weather conditions 10) desertification a) general weather conditions b) the process by which land changes into desert c) it decays naturally

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