Assignments

1. Answer the following questions:

1. What are sedimentary rocks made of?

2. How does the process of weathering and erosion help form sedimentary rocks?

3. What two classifications of sedimentary rocks do you know?

4. What are the groups of sedimentary rocks according to the size of particles in them? Characterize all of them.

5. What helps rock fragments cement together?

6. Can you describe sedimentary rocks of chemical origin?

7. Can you describe sedimentary rocks of organic origin?

2. Find in the text the English equivalents for the Russian words and expressions. Reproduce the contexts in which they are used.

обломки, осадки, песчаник, ископаемые, изнашивать породу, известняк, глинистый сланец, мелкозернистый, кварц, происхождение, обломочная порода

3. Suggest the Russian equivalents

clastic rock, process of weathering, to cement together, to wear away the rock, to evaporate, conglomerate, coarse sandstone, clay, remains of life.

4. Find synonyms among the given words:

split, deposit, rubble, fragment, splinter, bed, break, pebble

5. Find antonyms among the given words:

Fine, dark, hard, deep, soft, coarse, shallow, light

6. Say if the following statements correspond to the text. Correct the wrong ones.

1. Sedimentary rocks make up about 75 per cent of the earth’s crust.

2. Sedimentary rocks are always the formation of particles from older rocks.

3. Conglomerate is a rock formed from fragments of pebbles size or larger.

4. Sandstones are the most common of sedimentary rocks.

5. Shales are usually fine-grained, light or dark in color.

6. When the rock fragments are like grains of sand, the rock is called sandstone.

7. Of sedimentary rocks 32 per cent are limestones.

8. Plants and animals cannot form sedimentary rocks.

7. Analyze the diagram and speak on it.

8. Just for fun.

						1	9
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5
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		8

Across:

1. It is formed from mud and silt, becomes metamorphosed into slate.

2. The continents are supported by it.

3. The outer layer of the Earth.

4. A natural accumulation (as of iron ore, coal, or gas).

5. A sedimentary rock, 22 % of all sedimentary rocks.

6. A rock, but not a mineral formed from swamp plants.

7. A rock-forming mineral.

8. Clastic fragments.

Down:

9. A property of all rocks.