Автор статьи
Валерия
Эксперт по сдаче вступительных испытаний в ВУЗах
- investigation, 2. founder, 3. highly, 4. external, 5. consolidate, 6. valuable, 7. sedimentary, 8. specific.
- Metamorphic rocks have been derived either from igneous or from sedimentary rocks.
- Neither the thickness of overburden nor the angles of dip and strike were determined correctly.
- The Moscow Mining Academy trains both mining engineers and technicians.
- Both miners were highly skilled workers.
- They (to have) opened the new road.
- She told me she (to have) never been to London before.
- She is the best student in the group: she (to have) a good command of English.
- They (to have) explored those coal deposits by the end of this month.
- Students course is designed on a modular basis.
- The modern equipment is effective.
- The decomposition of rocks under the direct influence of heat and cold is called physical weathering.
- Mineral fuels are organic materials accumulated in the geologic past.
- Using modern mining equipment allowed the miners to increase the output of coal.
- Core-drilling is used in prospecting for loose rocks.
- Explosives are used for excavating hard rocks.
- The thickness of ore deposits is a constant value.
- Coal beds may consist of different bands of varying thickness.
- It should be noticed that the theory of prospecting and exploration is a link connecting specialists in two fields of mining: the exploration geologist and the mining engineer.
- Bituminous coals cannot be stored in open piles.
- Mining can be done either as a surface operation or by an underground method.
- I have to study hard to become a highly qualified mining engineer.
- Surveyor must be very attentive an accurate.
- They will be able to work as mining engineers in five years.
- We are to pass our exams at the end of each term.
Minerals
Minerals that make up rocks, are defined as inorganic substances which occur naturally and have a definite chemical composition and physical properties which vary within known limits. The major properties are colour, crystal form, hardness, cleavage and others. Cleavage is one of the most diagnostically useful mineralogical properties which can be found throughout the mineral. Minerals of use to man can be grouped into two broad categories: 1) metals, such as aluminium, copper, gold, silver, iron-tin, platinum, chromium, nickel, lead and zinc, and 2) non-metallic minerals, such as diamonds, salt, limestone, cement, sulphur, and asbestos. When minerals occur so that they can be worked at a profit they are called ore deposits. Mineral deposits are seldom equally rich throughout. Economic minerals are those which are of economic importance and include both metallic and non-metallic minerals. Most minerals consist of several elements. Such elements are oxygen, silicon, titanium, aluminium, iron, magnesium, calcium, sodium, potassium, and hydrogen. They make up more than 99 per cent by weight of all the rock-forming minerals. Of these, aluminium, iron and magnesium are industrial metals. The other metals are present in small quantities, mostly in igneous rocks. 7) Составьте план к тексту в форме простых предложений.
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