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3. Comprehension check.

  1. What types of sedimentary rocks do you know?

  2. How is clastic sediment named?

  3. What is sorting?

  4. What factors does sorting depend on?

  5. What affects sorting?

  6. What is lithification?

  7. What does the word sandstone refer to? What does sandstone commonly consist of?

  8. What is chert?

  9. How does coal form?

4. Word-building.

a) Give the verbs corresponding to the following nouns and translate them into Russian:

division; erosion; abrasion; conclusion; production; lithification; precipitation; rotation; accumulation; circulation; compaction; evaporation.

b) State to what part of speech the following words belong and translate them into Russian:

flat – flatten – flattened; rotate – rotation – rotational; constitute – constituent – constitution; transport – transportation – transporting – transported; deposit– deposition – depositional; depend – dependent – dependence – depending – independent – independently; vapor – evaporate – evaporation – evaporating; vary – various – variable – variation – variety; loose – loosen.

5. Lexical exercises.

a) Find in the text equivalents of the following:

проточная вода; эродировать разложившуюся породу; большое экономическое значение; главный энергетический источник; состоять из обломков выветренных пород; округленные частицы; впадать в океан; во время транспортировки; разбивать породу на части различных размеров; сопротивление течению; предохранять частицы от абразии; прочность частиц влияет на сортность; состоять из ила и песка; обращать несцементированные осадки в твердую породу; состоять из литифицированных песчаных зерен.

b) Match the words in (1) with the words in (2) and translate the word combinations into Russian:

1. Flowing; raw; clastic; sand; plant; loose; hard; dark; flat; microscopic; main.

2. Component; sediment; surface; material; grains; rock; water; remains; examination; in color.

6. Summary.

Sedimentary rocks cover about three fourth of the Earth’s land surface.

Clastic sediment is sediment composed of fragments of weathered rock called clasts. Clastic sediment is rounded and sorted during transport and then deposited. Most sediment becomes lithified by compaction and cementation.

Clastic sedimentary rocks are composed of lithified clastic sediment and are named and classified primarily according to the size of the clastic grains. Common types are conglomerate, sandstone, siltstone, shale, claystone, and mudstone.

Organic sedimentary rocks are made up of the remains of organisms. Coal and chert are common organic sedimentary rocks.

Unit VII METAMORPHIC ROCKS

P a r t I

1. Read and translate the following words and word combinations.

Moist clay; the breakdown of the clay mineral; to increase the mobility of atoms; solid-state reaction; a parent rock; to decompose; to recombine; within a certain temperature range (pressure range); to alter chemical environment; environmental conditions; marble; quartzite; mica; garnet; foliation; the parallel alignment; to be different in origin; slaty cleavage; the intensity of metamorphism; metamorphic grade; the geothermal gradient; fossiliferous limestone; recrystallized quartz grains