Geology. Козлова Е.П. - 52 стр.

                VI Section VI Grammar Revision Exercises

The Active Voice

1) The largest employer of geologists has traditionally been the oil industry, although
recently more opportunities have been available in environmental geology with
consulting firms and government agencies.
2) The earth’s crust undergoes periodical compressions and tensions.
3) These students will be studying mineralogy during two semesters.
4) Rocks whether igneous or sedimentary constitute manuscripts of past earth history.
5) Scientists divided minerals into the rock-forming minerals and the ores.
6) Scientists are studying the geological past of our district.
7) Aerial photography plays an important part in prospecting virgin coal-fields.
8) Coal will yield large quantities of chemicals.
9) Since ancient times people have used sulphur for its medical properties in the
treatment of people and animals.
10) The motion of the mantle is driving the surface motion of the continental plates,
it’s driving mountain building, earthquakes and hot spots, like volcanoes.
11) Research on sea-floor hydrothermal mineralization and related processes has
advanced rapidly from local to global scope through a sequence of discoveries.
12) This information will give us a basic understanding of what rocks actually are.
14) Measurements had shown that temperature increased.
14) Volcanic ash has hardened into rock.

The Passive Voice

2) Many of the conclusions of physical geology are based on the conviction that
    modern processes also operated in the past.
3) A glacier is a mass of ice that has been formed by the recrystallization of snow.
3) Internal water is derived from the interior of the earth as a new resource.
4) Hard coals are mined practically everywhere.
5) The repetition of the outcrop may be very deceptive, when the surface has been
planed down to one uniform slope or curve.
6) The coal-mining industry of the U.K. has been nationalized since 1947.
7) Disputed zones were found where rocks had been deposited during the time of the
unconformities at the type section.
8) Acoustic detectors that can be operated at the earth’s surface and in the atmosphere
are being developed.
9) The standard methods have been treated elsewhere and will not be repeated here.
10) Research has been concerned with measurement of magnetic field.
11) Our knowledge about the subcrustal origin of magma is based on data of
geophysical research, petrological and geochemical relations between the igneous
rocks and experiments results.
12) The use of spectroscopy for material analysis has been adapted for down-hole
logging in both the coal and oil industries.
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