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1. Match the words with the Russian equivalent.

  1. to consist of а. перевисать; выдавливать

  2. to dissolve in b. подверженный чему-либо

  3. to produce c. соединять; сочетать

  4. to accumulate d. осаждать; оседать

  5. to roll around e. лежать в основе

  6. to be made of f. выпадать в осадок

  7. to alter g. изменять(ся)

  8. to form h. образовывать; составлять

  9. to underlie i. переворачивать(ся)

  10. to precipitate j. созданный; изготовленный

  11. to settle k. создавать; порождать

  12. to combine with l. накапливать(ся)

  13. to be liable to m. состояться; заключаться

  14. to force up n. растворяться

2. Translate the following word combinations and phrases.

  1. rocks and minerals consist of chemicals

  2. tiny balls are produced by calcium carbonate accumulating on particles

  3. limestone is mainly made of the mineral dolomite

  4. limestone occurs where certain brines chemically alter preexisting rocks

  5. evaporites underlie one-quarter of the continent

  6. chemical deposits accumulate in evaporating desert lakes

  7. three main minerals settle in a sequence

  8. soft, low density rock is liable to flow

  9. pressure forces up huge plugs

  10. certain old evaporites precipitated from chemically oversaturated deep offshore waters

3. Compose questions to the text, using the following Wh-words: what, which, where, when, how

EX. Oolitic limestone consists of billions of oolitites.

WHAT does oolitic limestone consist of?

3.2 Informative reading- Rocks from fragments

3.2.1 Read the text (Part 1, Part 2) and for statements 1-12, choose the best answer: a, b, c or d. Then explain the words in bold. Part 1

Most sedimentary rocks form from particles eroded from the rocks on land. Their main ingredients are clasts (rock fragments) of quartz, feldspar and clay minerals. These fragments range in size from microscopic grains to boulders.

More than 90% of all sedimentary rock contains particles no bigger than a sand grain. Many geologists classify such particles by size in two main groups. The (fine-grained) lutites with grains less than 0.06 mm diameter produce mudstone, siltstone and shale. The (medium-grained) arenites or sandstones with grains of 0.06-2 mm give arkose, graywacke and orthoquartzite. Here are brief descriptions of six fine- and medium- grained rocks.

  1. Mudstone- solid rock made of clay minerals of less than 0.004mm diameter.

  2. Shale - mudstone, siltstone or similar fine-grained rock of silt and clay split easily along its bedding planes. Shale accounts for more than 80% of all sedimentary rock.

  3. Siltstone- rock formed of particles 0.004-0.06mm in diameter.

  4. Orthoquartzite- a “clean” or pure arenite mainly made of quartz after other substances have been removed. (Arenites account for more than 10% of all sedimentary rock)

  5. Arkose- an arenite rich in feldspar derived from gneiss or granite.

  6. Graywacke- a muddy, often grayish sandstone with mixed-size particles including quartz, clay minerals and others.

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