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10. Answer the following questions:

1. When did pollution appear? 2. When did pollution increase? 3. Why did pollution increase? 4. What sources of air pollution do you know? 5. Where does much dust come from? 6. What compounds are considered to be the chief atmospheric gaseous pollutants? 7. What is photochemical smog? 8.  What can smog cause? 9. What is much more toxic than the initial substance? 10. Is it possible to achieve a progress in preventing cities from pollution?

11. Find in the text the English equvalents of the following words and word combinations:

будущее поколение; источник загрязнения; сырье; незначительное содержание; и малых количествах; в высокой концентрации; сокращение загрязнения; недостаток; потребляемые материалы; улучшать; вредный; следует отметить; продукты окисления; исходные вещества; в огромных количествах; считается, что; установлено, что; давно выяснено, что; известно, что;.

12. Retell the text, using the phrases like “it is stated”, “it is known”, “it has been found out that” and so on.

13. Read about ordinary water and transform the word given in bold at the end of each line into a suitable form that fits the space in the same line.

Lead

Lead is _1_ present in small amounts in soil, rocks, surface waters and the atmosphere. It is _2_ that atmospheric lead _3_ are widely distributed over all parts of the earth.

Due to its unique properties it has been _4_ used by human. This utility has _5_ in greatly elevated lead concentrations in certain ecosystems. In the areas where lead is _6_ mined, smelted and refined the environmental lead level is _7_ elevated. Those territories where industries and urban-suburban complexes are _8_ lead are also negatively _9_. It is widely agreed that a primary source of lead _10_ is the combustion of gasoline containing lead additives. The input of lead, its _11_ within forest ecosystems, its transfer in food chains, its residence in soil recquire _12_ research attention.

nature

find

part

wide

result

be

great

consume

affect

pollute

cycle

consider

UNIT V MAN-MADE ELEMENTS

Grammar: The Active Infinitive and the Passive Infinitive

Review of the Adverbs.

Text: Man-Made Elements

1. Translate and memorize the following words.

subtract

half-life

artificial

isolate

cause

substantial

accelerate

isotope

completely

attack

trace

particular

carry on

cyclotron

particle

2. Make sure whether you read these words correctly:

alkali, alpha, technetium, francium, neptunium, lawrencium, nucleus, neutron.

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