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V. Form verbs from the following words.

Class; disintegration; intense; concentration; solid; organ; evaporation; origin; foliation; modification; relation; lithification; circulation; character.

VI. Do the test. Only one variant is possible.

  1. The thickness of the layers of sedimentary rocks . . . . vary greatly from place to place.

  1. have to; b) can; c) may.

  1. Geology . . . . hardly exist without foundation of stratigraphy.

  1. may; b) have to; c) could.

  1. Geologists . . . . use indirect methods for getting answers to many questions.

  1. can’t; b) be able to; c) have to.

  1. If you rub sand between your fingers you . . . . see the grains with your naked eye.

  1. will be able to; b) can; c) must.

VII. Put questions to the sentences beginning with the words in brackets.

  1. Organic sedimentary rocks consist of the plants or animals. (Do?)

  2. Most limestone is composed of broken shell fragments. (What . . . of?)

  3. Graywacke is commonly dark in colour because of fine clay that coats the sand grains. (Why?)

VIII. Put the verbs in brackets into the correct form.

  1. The scientists know that the stars and clouds (to move) constantly.

  2. The climate on the Earth (to change) constantly.

  3. Geologists (to discuss) this problem nest month.

  4. They (to carry out) the experiment during the last two months.

  5. Different internal and surface processes (to modify) the earth continuously.

  6. Life (to originate) during Archean time.

IX. Read the text.

Weathering decomposes bedrock. Flowing water, wind, gravity, and glaciers then erode the decomposed rock, transport it downslope, and finally deposit it on the sea coast or in lakes and river valleys. Finally, the loose sediment is cemented to form hard sedimentary rock. Sedimentary rocks make up only about 5 percent of the Earth’s crust. However, because they form on the Earth’s surface, they are widely spread in a thin veneer over underlying igneous and metamorphic rocks. As a result, sedimentary rocks cover about 75 percent of continents. Many sedimentary rocks have high economic value. Oil and gas form in certain sedimentary rocks. Coal, a major energy resource, is a sedimentary rock. Limestone is an important building material, both as stone and as the primary ingredient in cement. Gypsum is the raw material for plaster. Ores of copper, lead, zinc, iron, gold, and silver concentrate in certain types of sedimentary rocks.

Are the following statements true or false?

  1. Sedimentary rocks cover a small portion of continents.

  2. Sedimentary rocks make up a small portion of the Earth’s crust.

  3. Surface agents erode the decomposed rock and deposit it on the ocean floor.

  4. Sedimentary rocks are widely spread over igneous and metamorphic rocks because they are formed in the Earth’s interior.

X. Translate from Russian into English.

  1. Образование осадочных пород начинается с выветривания всех типов пород.

  2. Осадочные горные породы имеют сложную структуру.

  3. Осадочные породы содержат все мировые запасы нефти, угля и все ископаемые остатки.

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