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5. What is an oil trap? List two conditions common to all traps.

Task 8. Copy out the most important sentences which show the main idea of the text.

TEST YOURSELF

Task 1. Tell whether the sentences are true or false. Correct the false ones.
1. Many nonmetallics are used up in the process of creating other products.
2. Fluorite and limestone that are part of the machinery process.
3. Nonmetallic mineral resources are commonly divided into two broad groups: building
materials and industrial minerals.
4. Limestone, as a building material, is used in making cement.
5. Gypsum, cement and aggregate go into the making of concrete.
6. Industrial minerals are used in the manufacture of chemicals and the production of
fertilizers.
7. A greater share of our future needs will eventually have to come only from coal.
8. All present-day coal usage is for the generation of electricity.
9. Surface mining can cause a lot of problems to the environment.
10. When the coal is burned, the sulfur is converted into noxious sulfuroxide gases.
11. Petroleum and natural gas consist of various hydrocarbon compounds mixed together.
12. The newly created petroleum and natural gas are not mobile.

Task 2. Underline the correct answer:
1. Limestone is only a building material / only an industrial mineral / can be found in both
categories.
2. Aggregate is a building material / an industrial mineral / can be found in both categories.
3. Garnet is a building material / an industrial mineral / can be found in both categories.
4. A greater share of our future needs in new petroleum reserves will eventually have to come
only from coal / only from alternative energy sources / from both coal and alternative
energy sources.
5. Only coal / coal, petroleum and natural gas / only petroleum and natural gas are
biological products derived from the remains of organisms.

UNIT 4
GEOLOGIC TIME

Task 1. Read and memorize the following words:
relative dating – відносна геохронологія; geologic time scale – шкала геологічного
визначення відносного віку часу
perceive - сприймати seek - шукати
numerical date – дата, що виражається sequence of formation – послідовність
цифрою напластувань (геологічних формацій, серій
пластів)
supplement - доповнювати breakthrough – прорив, перемога
outcrop of sedimentary rock layers – вихід на the law of superposition – закон суперпозиції
поверхню або оголення шарів осадових
порід
undeformed - недеформований principle of original horizontality – принцип
первинної горизонтальності
inclined – похилий; розташований під crustal disturbances – порушення земної кори
нахилом
conformable – узгоджене напластування unconformities – неузгоджене напластування