24. Укажите, какие предложения соответствуют содержанию текста 2. Подтвердите свои ответы фактами из текста.

1. Generally speaking, metamorphic rocks have been developed from ores.

2. Marble, slate and phyllite belong to the group of metamorphic rocks.

3. As is known, unlike granite metamorphic rocks have a schistose structure.

4. It is quite obvious that the role of water in metamorphism is great.

5. As a rule, low-grade metamorphic rocks are characterized by the absence of water.

6. Flaky materials cause the rock to split into thin sheets.

7. It should be noted that marble and quartzite are foliated metamorphic rocks.

8. The structure of metamorphic rocks shows the nature of older pre­-existing rocks and the mechanism of metamorphic deformation as well.

9. All metamorphic rocks are non-foliated.

25. Ответьте на следующие вопросы:

1. Do you know how metamorphic rocks have been formed?

2. Which rocks belong to the group of metamorphic?

3. Does gneiss have the same structure as granite?

4. Is the role of water great in metamorphism?

5. What rocks do we call foliated? What can you say about non-foliated metamorphic rocks?

6. How can geologists trace the original structure of metamorphic rocks?

7. Why are metamorphic rocks often called crystalline schists?

26. Заполните пропуски в предложениях, используя следующие слова: cleave cleaves cleavage

1. Metamorphic rocks which have a schistose structure can ....

2. As a result of splitting ... is formed.

3. Generally speaking, the constituents of gneisses are distributed in bands or layers and the rock ... easily.

relate related relationship relating (to)

1. The ... between rock pressure and temperature is interdependent.

2. The role of water in metamorphism can be characterized at least by four variable geologically ... parameters.

3. These parameters ... to each other.

4. At the Institute the students study the full range of subjects ... to mining, geology as well as mining mechanics.

27. А) Переведите следующие сочетания слов и предложения, обращая внимание на перевод прилагательных в сравнительной степени:

to observe the higher temperature at day time and the lower temperature at night

to become wider and deeper

to cause more complex and varied changes

to penetrate deeper

to become more and more destroyed

to decompose at a slower rate

There are deeper and wider cracks.

The action of plants is even more destructive.

b) Переведете сочетания слов:

to be more than 0.5 mm

to intrude into older pre-existing rocks

to have even finer grains

less than 0.5 mm

to form smaller rock masses

to be much longer

to cool much more rapidly

to cool more slowly

to crystallize to a larger-grain size

coarse-grained intrusive rocks

28. А) Подберите из списков а в б близкие по значению слова:

А. 1. band Б. a) allow (let)

2. cleave b) size

3. constituent c) fissure

4. foliated d) take place

5. be like e) speed

6. permit f) layer

7. crack g) split

8. occur h) component

9. rate i) flaky

10. dimension j) be similar to

б) Подберите из списков А в Б противоположные по значению слова.

А. 1. deep Б. a) shallow

2. cool b) low-grade

3. slowly c) non-foliated

4. vast d) rapidly

5. extrusive e) unlike

6. like f) intrusive

7. high-grade g) deficiency

8. common h) small

9. excess i) heat

10. foliated j) uncommon