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

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