Составьте текст из следующих предложений, расположив их в логической последовательности.

· Pure water is pumped down to the rock salt through a pipe.

· There are salt beds.

· The water dissolves the salt.

· Wells are drilled down to salt beds.

· The brine is evaporated.

· The brine, or salt water, is forced up to the surface through another pipe.

· The grains are dried and graded.

· The grains are formed.

· Table salt has a very fine grain.

Unit V. Test Section

(1) Выберите правильный вариант из приведенных в скобках. Объясните свой выбор.(or.)

(2) Запишите предложение, подчеркнув выбранный Вами вариант.(wr.)

(3) Переведите предложение на русский язык.(or./wr.)

1. Sedimentary rocks (originate/are originated) from other types of rocks by the processes of erosion.

2. Sedimentary rocks (are referred/referred) to as stratified rocks.

3. The three main divisions of the earth(are/there are): the crust, the mantle, and the core.

4. Molten magma (contains/is contained) large (quantities/qualities) of both oxygen and hydrogen.

5. Hydrogen is the lightest element (known/is known).

6. The (phenomena/phenomenon) is rather complicated and the process (involves/involved) is not yet clear.

7. Rocks deep in the crust (brought/are brought) to the surface by volcanic action.

8. The component grains of sandstone (there are/are) chiefly quartz.

9. Some sandstones (forms/are formed) from particles of sand by wind.

10. Metamorphism (changes/is changed) the (original/origin) characteristics of the rocks and minerals.

11. (They are/There are) some other (hypothesis/hypotheses) dealing with the (origin/original) of the Earth.

12. Soils usually (contain/constitute) a great variety of minerals.

13. (There are/There is) a great variety of minerals which (comprise/constitute) rocks.

14. The variation of temperature (varies/various) with (high/height).

15. The (mean/means) temperature of surface water on the Earth (vary/varies) from region to region.

16. The earth is (comprised/composed) of three major zones.

17. Earthquakes are geological (phenomena/phenomenon).

18. Due (to/of) its high degree of activity oxygen (occurs/contains) in the magma only in (combination/composition) with other elements.

19. Limestone (consists/includes) of calcium carbonate.

20. Geology is a (science/since) which deals (with/within) the history of the earth.

21. Three quarters of the earth’s surface (contain/consist) of water.

22. Oxygen and hydrogen combine to form water; the (later/latter) is an extremely active agent in the interior lithosphere.

23. (Some/Same) magma crystallizes to rocks (composing/composed) of one mineral only.

24. In (composition/combination) with hydrogen an carbon oxygen forms very widely spread (compounds/constituents) – water and carbonic acid gas.

25. Chemical substances may be (divided/described) into 3 classes: mixtures, compounds and elements.

26. The process is (called/referred) to as oxidation.

27. The winds carry (much/many) sands and dust.

28. Seismic (analyze/analysis) is based on different techniques.

29. Rock is one of the (hard/difficult) materials of which the earth’s crust is mainly (consists/composed).

30. The chief (compounds/components) of the air are nitrogen, oxygen, water vapour and carbon dioxide.

31. (Most/Much) minerals (consist/contain) of the elements (combined/combining) as chemical (composition/compounds).

32. (Mineralogically/Mineralogical) emerald is beryl.

33. Three large groups of rocks are commonly recognized on the basis of their (original/origin).

34. Only about 20 minerals are abundant (constitution/constituents) of the earth’s crust.

35. Rock may come into existence (through/though) the deposition.

36. Specific gravity (varies/various) with chemical composition.

37. In the crust of the earth (there/this) is a great (vary/variety) of minerals and rocks.

38. (They/These) conclusions are (base/based) on X-ray analysis (datum/data).

39. The exact (composition/compound) of this gas is not known.

40. Rock is one of the (solid/solidify) materials of which the earth’s crust is mainly (composed/compose).

41. Green transparent beryl is (calls/called) emerald.

42. The pearl (consisted/consisting) of calcium carbonate is formed within an oyster.

43. (There is/It is) some water vapour in the air.

44. Oxygen (knows/is known) as a stable element.

45. Rocks are solid (natural/naturally) (formed/forming) substances (made/making) up of minerals.

46. The earth’s solid part (is known/known) as the lithosphere is mainly (consists/built) up of rocks.

47. Usually magma (forms/is formed) minerals.

48. The rocks of the crust (are classified/classify) into three groups according to their (originate/origin).

49. Scientific data (is/are) analyzed by (scientists/sciences).

50. (Due to/because) (its/it’s) (high/height) (activity/action) oxygen (occurs/occurrence) in magma only in (combination/composition) with (another/other) elements.