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Fig. 27. Various modes of occurrence of igneous rocks

3.2.1 Read the following phrases and give the Russian equivalent.

accelerated process

unequal hardness

crystallized magma

adjacent rocks

weakly deformed minerals

mode of occurrence

rapidly cooled rocks

volcanic ash and dust

rocks formed by solidification

coarse-grained rocks

rocks exposed on the Earth’s surface

glassy surface

transformation caused by new conditions

rock fissures

3.2.2 Can these terms and phrases be understood without translating? Why?

Intrusive and extrusive rocks; plutonic intrusion; large crystals; volcanic rocks; mountain zones; zones of major deformation; mineral grains; granites and diorites; the group of intrusive or plutonic rocks; straight parallel walls; gigantic crystals; slowly-cooled batholiths; thick laccoliths; other plutonites; coarse-grained pegmatites; lava flow.

3.2.3 State, which sentences, is t (true) or f (false) according to the text.

1. Igneous rocks have been formed by sedimentation.

2. Intrusive rocks have been formed by the cooling of rocks of the Earth’s crust.

3. Extrusive rocks have been formed the same way as intrusive rocks.

4. The grain size of igneous rocks depends on mode o occurrence.

5. Exposed igneous rocks are numerous in mountain zones.

6. Granites and diorites belong to the group of extrusive rocks.

7. As a rule, granite may occur in dykes.

8. Pegmatites do not belong to the group of plutonic or intrusive rocks.

3.2.4 Match the English terms with the Russian equivalents.

1. adjacent layers

a. форма залегания, способ залегания

2. abyssal rocks

b.крупнозернистый

3. dimensions of crystals

c. зоны крупных нарушений

4. shape and size of grains

d. абиссальные (глубинные) породы

5. mode of occurrence

e. смежные пласты (слои)

6. coarse-grained

f. размеры кристаллов

7. uplifts

g. форма и размер зерен

8. zones of major deformation

h. взбросы

3.2.5 Match the Russian terms with the English equivalents.

1. затвердевшие массы

a. irregular shape

2. обломочные породы

b. at a certain depth

3. медленно остывать

c. solidified masses

4. мелкозернистый

d. to cool slowly

5. неправильная форма

e. existing types of rocks

6. многочисленные трещины

f. fine-grained

7. на определенной глубине

g. fragmentary rocks

8. существующие типы пород

h. numerous cracks or fissures

3.2.6 Complete the following sentences, using words and phrases from the text.

  1. Batholiths are composed of_____________________.

  2. Laccoliths are very similar to sills, but sills__________________.

  3. Granites belong to the group of_______________.

  4. Pegmatites are also____________.

  5. Dykes are intrusive bodies which ___________.

  6. Extrusive rocks have been formed from_________.

  7. The origin of intrusive rocks __________________.

  8. The grain size of igneous rocks may be different because_____________.

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