40. Укажите, в каких предложениях модальный глагол употребляется с инфинитивом в страдательном залоге. Переведите предложения:

1. We can observe physical weathering in deserts and high mountains. This phenomenon can best be observed in places where the changes in temperature are great.

2. Sedimentary rocks can be more or less unconsolidated during the process of sedimentation.

3. Sedimentary rocks can be found at or near the surface of the Earth.

4. Igneous activity can be considered as one of the most funda­ mental Earth processes.

5. As is known, igneous rocks can be extrusive and intrusive.

6. Like sands, sandstones can be divided into fine-grained, me­ dium-grained and coarse-grained.

7. One can divide all sediments into consolidated and unconsoli­ dated rocks.

41. 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

42. 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

44. 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