4.4. Listen to the lecture once more. Look at the diagram and describe the features produced by intrusive rocks, using the given definitions:

(R.P – 5.5)

1. batholith	a. saucer-shaped intrusion between rock strata
2. stock	b. a lens-shaped intrusion that domes overlying strata
3. boss	c. a sheet of igneous rock intruded horizontally between rock layers
4. dike	d. wall of igneous rock injected up through vertical crack in preexisting rocks
5. sill	e. small circular-surfaced intrusion
6. laccolith	f. a small irregular surface area
7. lopolith	g. huge deep-seated dome-shaped intrusion

4.5 You will hear a short conversation. At the end of it, you will be asked several questions. The conversation will be spoken twice. After you hear a question, read the four selections and choose the one that is the best answer to the sentence the speaker asked. Answer all questions according to what is stated/implied in the conversation.

1. Where does this conversation take place?

A. museum

B. exhibition

C. geological College

D. class

2. What is another term for igneous rocks?

A. hot spots

B. lava rocks

C. fiery rocks

D. molten rocks

3. What is the main topic of the conversation?

A. rocks and minerals

B. igneous rocks

C. sedimentary rocks

D. metamorphic rocks

4. What is the formation process of magma?

A. melting, cooling and solidifying

B. cooling, melting and solidifying

C. rising, melting and cooling

D. melting, rising and cooling

5. What are silicates?

A. silicon and oxygen and aluminum

B. silicon and oxygen and a metal

C. silicon and oxygen and silicate

D. silicon and oxygen and mafiс mineral

6. What does quartz consist of?

A. silicate and a metal

B. silicate without a metal

C. silicate without oxygen

D. silicon and oxygen

7. What are the two people?

A. a teacher and a student

B. geologists

C. a guide and a visitor

D. husband and wife

5. Discussion

TASK 1

Image a volcano and describe the development of it. You can use examples of different volcano eruptions (for example, St. Helen).

TASK 2

Here are 6 shapes of volcanoes: (R.P .-5.2)

1. loose-packed volcano

2. stratovolcano

3. caldera

4. rift volcano

5. spring hilltop

6. shield volcano

Describe one of them.

Fig. 28. Shapes of volcanoes

TASK 3

Look at the Volcano-cross-section (R.P – 5.1) and state what are the characteristic features.

6. Wordlist

6.1 Pronunciation

aa	[ʌʌ]
Aconcagua	[‚ækən׳kɑ:gwə]
anatomy	[ə׳nætəmɪ]
batholith	[׳bæθəlɪθ]
conduit	[׳kɔndjuɪt]
diatreme	[׳daɪətri:m]
fissure	[׳fɪ∫ə]
gabbro	[׳gæbrəu]
hemisphere	[׳hemɪsfɪə]
hypabyssal	[‚h(a)ıpə׳bɪsəl]
laccolith	[׳lækəlɪθ]
lava	[׳lɑ:və]
lopolith	[׳lɔpəlɪθ]
maar	[mɑ:ɑ:]
nuee ardente	[nu׳ji: ɑ:׳dentə]
pahoehoe	[pə׳houɪ͵houɪ]
Paricutin	[pə׳rɪkutɪn]
plateau	[׳plætəu]
pumice	[׳pʌmɪs]
pyroclastic	[͵paɪrə(u)׳klæstɪk]
reservoir	[׳rezəvwɑ:]
volcano	[vɔl׳keɪnəu]
Western Argentina	[׳westən ͵ɑ:dʒən׳ti:nə]
Western Mexico	[׳westən ׳meksɪkəu]