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

  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.

  4. The grain size of igneous rocks depends on mode of 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. Письменно ответьте на следующие вопросы по тексту:

  1. Have igneous rocks crystallized from magma or have they been formed by sedimentation?

  2. Which types of igneous rocks do you know?

  3. What does the grain size of igneous rocks depend on?

  4. Can you give an example of intrusive or plutonic rocks?

  5. Are diorites intrusive or extrusive formations?

  6. What do you know about batholiths?

  7. Do pegmatites belong to the group of plutonic or volcanic rocks?

  8. How do pegmatites occur?

  9. What minerals are igneous rocks rich in?

4. Найдите в правой колонке русские эквиваленты следующих слов и словосочетаний и выпишите их:

  1. adjacent layers

  1. способ залегания

  1. abyssal rocks

  1. крупнозернистый

  1. dimensions of crystals

  1. зоны крупных нарушений

  1. valuable minerals

  1. абиссальные (глубинные) породы

  1. shape and size of grains

  1. смежные пласты (слои)

  1. mode of occurrence

  1. размеры кристаллов

  1. coarse-grained

  1. взбросы

  1. uplifts

  1. форма и размер зерен

  1. zones of major deformation

  1. ценные минералы

5. Соедините главные предложения с придаточными:

  1. Abyssal rocks belong to the group of intrusive rocks

  1. that are economically important.

  1. Uplifts in mountain belts have permitted erosion to the depths

  1. which usually cut through plutonites.

  1. Granites and diorites occur as batholiths

  1. because they are intruded into pre-existing rocks.

  1. Pegmatites (quartz, orthoclase and mica) occur in numerous veins

  1. at which plutonic masses are formed.

  1. Extrusive igneous rocks have been formed as lavas

  1. where the changes in temperature are great.

  1. Igneous rocks are rich in minerals

  1. which come from fissures to the surface of the Earth's crust.

  1. Physical weathering occurs in the deserts and in high mountains

  1. which are large irregular masses.