Comprehension check. 1. Describe the main factors that cause and control metamorphism

1. Describe the main factors that cause and control metamorphism.

2. What is the upper limit of metamorphism?

3. What changes does metamorphism refer to?

4. What mineralogical changes can happen to a rock?

5. What is a stable mineral?

6. When can a mineral become unstable?

Word-building.

Find in the text the derivatives from the following words and define to what parts of speech they belong:

To compose; to combine; to grow; hard; to melt; mobile; to transform; to move; stable; rapid; to lock; to vary; to form; to foliate; to orientate; to align; thick; bed.

Lexical exercises.

a) Find Russian equivalents of the following words and word combinations in the right column:

I Stable mineral 1) гранит

II Chemical composition 2) полевой шпат

III Within a certain temperature range 3) сланцеватость

IV To alter both the texture and mineral 4) при нагревании

Content of a rock 5) устойчивый минерал

V Feldspar 6) в определенном температур-

VI Slaty cleavage ном режиме

VII Garnet 7) изменить как текстуру, так и

VIII Marble минеральное содержание

IX In a certain chemical environment породы

X When heated 8) химический состав

9) мрамор

10) в определенной химической

Среде

b) Choose corresponding adjectives in the list (1) for the nouns in the list (2):

1. Metamorphic; chemical; mineral; unstable; textural; large; tectonic; geothermal.

2. Forces; amounts; mineral; rocks; reactions; gradient; stability; changes.

P a r t II

Read and translate the following words and word combinations.

The texture of a metamorphic rock; contact metamorphism; a metamorphic halo; intrusion; with random orientations; the hornfels; fine-grained rock; hornblende; burial metamorphism; to drill; to be lithified; argillite; widespread type of metamorphism; to squeeze and deform rocks; to be strongly foliated; slate; to develop slaty cleavage; wavy or wrinkled surface; to give phyllite a silky appearance; clay-rich mud

Read the text.