Соедините главные предложения с придаточными.

1. Rock disintegration does a) whereas with the fall of
not occur uniformly and night they begin to con-
at an equal rate tract.

2. Under the influence of 6) until they are finally trans-
contraction and expans- formed into sand, gravel or
ion rock cracks are dust.

formed в) because it does not cause

108________________________________________ Unit 4

3. During the day under any change in the chemical
the influence of heat, composition of rocks,
rocks expand r) which gradually become

4. Physical weathering can wider and deeper.

best be observed in the д) as rocks are composed of
deserts different minerals.

5. Rocks gradually decom- e) where the changes in tern-
pose perature are great.

6. The process of physical
weathering is purely
mechanical

Задайте вопросы по образцу (Специальный вопрос).

Образец: Weathering takes place in the upper layers of the Earth's crust, (where?) -> Where does weathering take place?

1. The main cause of physical weathering is the change in tem­
perature, (what?)

2. Physical weathering can best be observed in the deserts and
high mountains, (where?)

3. Oxygen, carbon dioxide and water are the main chemical
agents which cause the destruction of rocks, (what agents?)

4. Certain marine organisms accelerate the destruction of rocks
by making holes in them to live in. (how?)

43. Выразите несогласие со следующими высЕазыванмми и подтвердите
свою точку зрения фактами из текста. Используйте предлагаемые разговор­
ные формулы:

it seems to be wrong; I can't agree with you; on the contrary; in my opinion; as far as I know; that's wrong

1. Physical weathering is not caused by the changes in tempera­
ture.

2. In the regions of a moderate or cold climate, the decomposi­
tion of rocks is not facilitated by the action of water.

3. The difference in physical and chemical weathering is that
physical weathering causes great changes in the chemical composi­
tion of rocks.

4. It is quite obvious that plants and organisms do not affect the
destruction of rocks.

Unit 4_____________________________________________ 109

Суммируйте содержание текста Б, используя слова в скобках.

1. The main cause of physical weathering, (the change in tem­
perature, to observe, to expand, to contract, to crack, to be hardly
noticeable, to be facilitated by)

2. The main cause of chemical weathering, (to be subjected to, to
contain, to act as, to cause changes, to be transformed into)

3. The effect of organisms and plants on the disintegration of
rocks, (to accelerate the destruction of rocks, to penetrate into, to
develop lateral pressure, to destroy rocks)

В

Прочитайте текст В без словаря. Скажите, о чем говорится в нем.

Слова для понимания текста:

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