Student A

... (What...?) are major sources of different kinds of pollution. Emissions of chemical and oil-recycling industries are extremely dangerous. The greatest atmospheric pollutants are... (What...?).... (What is...?) are caused by the combustion of oil and petrol. Exhaust of cars produces nitrogen oxide.... (What...?) affects greatly on water pollution. Fuel oil enters oceans mainly from... (Where... from?). Spills of oil in the sea kill... (What...?).

Student В

Oil and its products are major sources of... (What... of?). Emissions... (What...?) are extremely dangerous. The greatest atmospheric pollutants are the carbon dioxide, hydrocarbons, etc. Hydrocarbons are caused by... (What... by?).... (What...?) produces nitrogen oxide. Oil affects greatly on... (What pollution... on?) pollution.... (What...?) enters oceans mainly from oil tankers and offshore oil wells. Spills of oil... (Where...?) kill both flora and fauna.

Exercise 7. Answer the following questions.

1. What kinds of environmental pollution do you know? 2. Why is air pollution so dangerous? 3. What are the greatest atmospheric pollutants? 4. What is water pollution? 5. How does oil pollute world's water?

Exercise 8. Fill in the gaps with correct prepositions (for, by, on, from, to, of under, in into).

Most air pollution results... combustion processes. 2. During a combustion process some types of pollutants are released... the air. 3. The problem... atmospheric pollution control is very difficult. 4. Engines used... ground transportation or air transport are the largest sources of atmospheric pollution. 5. Most people play the main role... polluting air. 6. Hydrocarbons are caused... the combustion of oil and petrol. 7. Water pollution is caused by flowing of the poisonous water... different rivers, lakes and seas. 8.... normal circumstances, inorganic substances have little or no effect... life within the body of water.