UNIT 4 TEXT WEATHERING GRAMMAR REVISION PRONOUM “IT”; DOUBLE CONJUNCTIONS Ex.1. Read the following international words and word combinations and give their Russian equivalents. Action of agencies; destructive effect; lithosphere; disintegration; bacteria; complex process; to combine; general groups; operate in nature; intensity of chemical reactions. Ex.2. Translate the following word combinations paying attention to the words of the same root : near – A near distance, near the earth’s surface, nearly equal in density high – A high mountain, high in the sky, highly deformed rock layers deep – A deep-seated rock, deep in the ocean, deeply altered by metamorphic agents hard – Hard underlying rocks, hardly visible without a microscope, to work hard close – A close contact, close to the surface, closely related branches of geology poor – A poor conductor of heat, poorly supplied with water, poor people ready – A ready answer, readily dissolved by water profound – Profound volcanic activity, profoundly modified by metamorphism uneven – Uneven surface, unevenly distributed on the earth’s surface Ex.3. Translate the following sentences. Pay attention to different meanings of “it”. e.g. 1. It is interesting to know everything about the earth on which we live. Интересно знать все о земле, на которой мы живем. 2. It is geology that gives us some information of the earth. Как раз геология и дает нам сведения о земле. 3. It is known that our earth is a ball of rocks. Известно, что наша земля представляет собой «каменный» шар. 4.Look at figure 1. It is a picture of various crystal forms. Посмотрите на рисунок 1. Это рисунок различных форм кристалла. 5.Mineralogy is a subdivision of geology. It is the science of minerals. Минералогия – это дисциплина геологического цикла. Она изучает минералы. 1. It is necessary to use some modern tools to make a close investigation of any rock forming the earth crust. 2. It should be noted that the order of deposition is from bottom upward. It can be distinctly observed by the microscope. 3. It was not until the late 18th century that geology emerged as a science. 4. It is the change in the velocity of currents as well as other factors that results in bedding or layering. 5. It is the business of mineralogist to learn the characteristics of minerals. 6. It is clear that mineralogy is an important part of geology. 7. Most of the hard, naturally formed substances of the earth’s crust are referred to as a rock. It occurs in the form of layers or in irregular masses. It originated in many ways. 8. It is important to note the relative weight of the specimen examined because it often aids in recognizing the species. 9. It is most common for a given type of rock to possess two or more mineral species (as granite). 10. It is the science of geology that reveals so much knowledge of the physical world. 11. It was Newton who first showed that because of the earth’s daily rotation, its matter is affected not only by inward gravitation, but also by an outward centrifugal force. 12. It is the process of deposition that produces sedimentary rocks. Ex.4. Fill in the blanks with the double conjunctions: “both…and”, “either…or”, “neither…nor”, such as. Translate the sentences. 1. Historical geology deals… with the sequence of events brought about by the operation of the physical processes,… with the history of the long procession of life through the ages. 2. Cleavage flakes of mica are … flexible … elastic. 3. They could find … any plant … animal remains in the rock sample. 4. … igneous … sedimentary rocks can be transformed into metamorphic rocks. 5. Molten materials can be … thrown up to the surface … can solidify deep underground. 6. … water … solid earth is a good conductor of heat. Ex.5. Translate the following sentences into Russian. Pay attention to the underlined words. 1. The high velocities of steep streams especially when in flood, make their current almost irresistible. 2. The metamorphic rocks are, on account of their complicated nature and origin, difficult, if not impossible, to classify satisfactorily. 3. The discovery of a favourable structure does not, of course, guarantee that oil will be found. On the other hand, the absence of surface indications is no proof that oil will not be found; it may also mean that oil, if there, is sealed so efficiently that it cannot escape. 4. The work of solution accomplished by a stream flowing over a hard igneous rock like granite is less effective because the quartz in this rock is little, if at all, affected. 5. The question often arises as to what effect, if any, variations in reservoir properties have on the amount of hydrocarbon reserves present. Ex.6. Translate the following sentences. Pay attention to preposition “through”. 1. Underground water returns to the surface through springs and seepages. 2. In plants water is evaporated through leaves. 3. Oil is transported through pipelines. 4. Rocks through which water passes freely are called pervious. 5. Minerals can be identified through X-ray diffraction, spectrographic and thermal analyses. WORDS TO THE TEXT “WEATHERING” 1. crumble v. крошить(ся) To crumble is to break apart into lots of little pieces. 2. decay v. гнить, разлагаться Organic substances are slowly decaying under the action of natural chemical processes. decay n. 3. destruction n. разложение разрушение The floods brought death and destruction to the area. destructive a. разрушительный a destructive storm 4. crevice a. щель, расщелина Small creatures hide in the rock crevices. 5. loss n. потеря loss of interest; loss of control 6. disrupt v. подрывать, нарушать Climate change can disrupt the agricultural economy. 7. wedge n. клин V-shaped piece of wood; to drive a wedge between two people. 8. namely adv. именно, то есть Three students were mentioned, namely John, Steve and Sylvia. 9. distinguish v. различать, отличать The boys were so much alike that it was impossible to distinguish the one from the other. 10. feldspar n. полевой шпат 11. precise a. точный, аккуратный syn.-exact precise measurement 13. simultaneously adv. одновременно In nature different processes may often occur simultaneously. Ex.7. Read the text and 1) Find the sentences with “it” and analyze them. 2) Name the agents of weathering. WEATHERING It has been found that all the materials of the outer, or crustal, portion of the earth are subject to change. Under the action of the weather and other more or less closely related agencies, even the hardest and most resistant rocks crumble or decay in the course of time. The destructive effect of the atmosphere on the lithosphere is called weathering. The disintegration of rocks is effected through the action of external agencies such as wind, rain, temperature changes, plants and bacteria. It is the atmosphere that is the most important factor in the complex set of processes called weathering, the atmospheric gases and temperature changes being the most significant agents. Additional help in the weathering processes comes from water and chemicals dissolved in it, and, to a less extent, from light and organisms. The various agents may work together or may be combined in carrying on weathering. For example, water in rock crevices, through sufficient loss of heat and drop of temperature, will freeze, expand, and disrupt the rock through the force of wedging. Such weathering requires two agents, namely, water and temperature change. Broadly considered, there are two general groups of weathering processes – one mechanical, and the other chemical. In mechanical weathering the rock breaks up or crumbles with little or no change in the composition of the material. It is essentially a physical process of disintegration. Chemical weathering is mainly brought about by the action of substances dissolved in rain water. They are acidic in character. Rocks which are exposed to the oxygen and carbon dioxide of the atmosphere change in chemical composition. In chemical weathering the composition of rock or mineral matter is more or less altered during its breaking up. It is essentially a process of decay or decomposition. Although the processes of disintegration and decomposition may be thus distinguished, nevertheless they commonly operate together in nature. The presence of micro-organisms in the upper layers of the earth crust increases the intensity of chemical reactions. Thus, according to V.I. Vernadsky, feldspar undergoes weathering only when bacteria participate in the process. When water and carbon dioxide are the only agents, weathering hardly affects feldspar. Organisms alter rocks both mechanically and chemically. It is often very difficult, if not impossible, to draw a precise line between different types of weathering as in nature they usually act simultaneously. Ex.8. Find in the text from Ex.7 a) Synonyms Part, to alter, decomposition, bring about, significant, degree, different, unite, enough, to need, widely, chiefly, to differentiate, to be subjected, exact. b) Antonyms Inner, internal, contract, rise, absence, simple, similar, to heat. Ex.9. Translate the following paying attention to the different meanings of the underlined words. Hard rock – hard work, solution of limestone – solution of the problem; source of minerals – river source; river bed – rock bed; one degree Centigrade – to a considerable degree; a mountain range – a large range of sizes – to range widely in size; modern means of investigation – this means that…; the subject of great interest – the subject of the sentence – in regions subject to earthquakes; a drop of acid – a sudden drop of temperature; hundreds of square miles in extent – to be modified to a great extent; periods of cold weather – to weather rather rapidly; the most common minerals present in such rocks – in the present century – at present – to present some interesting features; close contact – close examination – close to the poles; only in sedimentary rocks – the only representative of the group. Ex.10. Translate the following word combinations: Erosion –resistant rocks; more easily erodible rocks; colorless substances; commonly occurring in regions subject to earthquakes; closely related phenomena; loosely consolidated sediments; sufficiently resistant to erosion; the naturally formed mineral matter; wind-laid dust deposits; loosely packed and poorly cemented deposits; alternating layers of hard and soft rock; wind-built sand hills; much richer in quartz than any nearby source rock; well-rounded uniformly sized grains of quartz; a layer of disintegrated rock formed by weathering; thin layers of alternating fine and coarse material; deposits composed of mechanically derived fragments; any other similarly displaced body. Ex.11. Fill in the blanks with the appropriate words given in brackets and translate the sentences into Russian. 1. The freezing of water in . . . and . . . in rocks . . . the disintegration of the rocks, for water in freezing . . . about one-eleventh of its . . . and exerts great pressure. (expands, pores, brings about, cracks, volume). 2. This pressure is . . . to . . . soft rocks . . . by partial . . .. (decay, weakened, sufficient, disrupt). 3. Highly porous rocks such as sandstones, whose pore space commonly . . . .from 10 to 30 per cent, are . . . in this way and so are jointed rocks in whose . . . ice . . . form. 4. Rocks are subject to . . . when they are heated and to . . . when they are cooled.(contraction, expansion). 5. . . . , or chemical weathering, is the term for . . . of rock that is accompanied by . . . in chemical and mineralogical . . . (changes, composition, decay, decomposition). 6. Rocks are . . . by alternate . . . and cooling. The heat of the sun . . . the surface layers of the rocks; cooling . . . them to contract.(causes, affected, heating, expands). 7. Rocks which are . . . to the oxygen and carbon dioxide of the atmosphere . . . in chemical . . . Iron in the rocks combines with oxygen, forming iron oxide. Other minerals join with oxygen or carbon dioxide. Thus the rock is . . . or “broken up”.(decomposed, exposed, change, composition). Ex.12. Translate the following word combinations into English. 1.под действием факторов выветривания; 2.при существующих условиях; 3.под вымышленным(assumed) именем; 4.по существующей классификации; 5.под руководством; 6.под заголовком. Ex.13. Translate the following sentences into English. 1. Под действием выветривания происходит разрушение пород. 2. При данных условиях выветривание становится более разрушительным. 3. Под действием больших давлений зерна песка уплотняются. 4. При существующей классификации различают три основные группы пород. 5. Под защитой растительного покрова породы более устойчивы к разрушению. Ex.14. Translate the following sentences into English. Use the double conjunctions “both…and; either…or; neither…nor”. 1. Растения и животные как прямо, так и косвенно влияют на разрушение пород. 2. Известно, что дождевая вода оказывает либо механическое, либо химическое воздействие на породы земной коры. 3. Ни состав, ни строение горных пород не являются однородными. 4. При определенных условиях и магматические, и осадочные породы могут быть преобразованы в метаморфические. 5. Метаморфические породы образуются как из осадочных, так и из магматических пород. Ex.15. Translate the following sentences into English. 1. Все вещества, составляющие внешнюю часть земной коры, подвержены воздействию различных атмосферных факторов. 2. Под действием этих процессов с течением времени происходит разрушение даже самых твердых и устойчивых пород. 3. Действие различных атмосферных факторов, вызывающих разрушение и распад пород, называется выветриванием. 4. Выветривание может быть двух видов. 5. При механическом выветривании вещества разрушаются под действием температурных колебаний (изменений), морозного выветривания и различных организмов. 6. При химическом выветривании горные породы растворяются и химически разлагаются под действием атмосферных факторов. 7. Атмосферными факторами, как известно, являются дождевая вода, ветер, морозное выветривание, а также животные и растения. Ex.16. Answer the following questions. 1. What is referred to as weathering? 2. What are the agents of weathering? 3. What are the types of weathering processes? 4. What is the difference between chemical and mechanical weathering? 5. What is the role of micro-organisms in the process of weathering? 6. Can you draw a precise line between mechanical and chemical weathering? Ex.17. Give a heading to the following text. Wind is an important geological agent of erosion and transportation of rock material, but it is less effective than running water. Wind is a significant agent of gradation. Its work is mainly twofold: a)erosion and b)deposition. Wind erosion is mostly of two types – deflation and corrosion. Both, of course, accomplish removal and transportation of rock material, but the first is done without the aid of tools, whereas the second requires the assistance of grinding materials. Winds not only erode, transport, and deposit rock materials, but also stir up waves and shore currents which in turn become effective and important agents of gradation. Ex.18. Read the text, divide it into logical parts and make a summary of it. Weathering and Erosion The processes of weathering and erosion are going on continually all over the world. Weathering is related to the surface of the lithosphere because it takes place where rocks, air and water come together. Weathering causes much rock material to be broken up and decomposed. It is a static process. On the contrary, erosion is a dynamic process; it requires transportation of the rock waste to a new location. The loosening and carrying away of rock debris by moving agents operating at the surface is called erosion. Indeed, weathering, erosion and deposition are the three main factors in an endless cycle of rock change: weathering prepares the rock for transportation by decomposing and disintegrating it; erosional agencies transport the material to a different locality (for example, the ocean), and there deposit it in strata which then may be cemented into rock. This rock may then be raised above sea level to the air and the rains, and again weathered and eroded to start a new cycle. Ex.19. Translate the following text in writing. Use a dictionary. Rate of Weathering The rate of weathering depends upon the nature of the rocks and the kinds and conditions of the weathering agents which operate upon them. It is a matter of common knowledge that many stone buildings and monuments show marked effects of weathering. An excellent case in point is Westminster Abbey in London which was built of weak, rather porous stone in the 13-th century. Many of the outer stones are badly weathered; some of its ornamental parts have been reduced to shapeless forms. Many of the exterior carvings of soft limestones of the Louvre in Paris are also badly weathered. Inscriptions on many tombstones and monuments only one or two centuries old are often nearly or quite illegible, due to weathering. Weathering is, however, much less rapid in the case of hard, resistant rocks. Thus, even the polished surface of a very resistant rock, like granite or quartzite, may be preserved for many years, although exposed to very changeable weather conditions. There are ways of estimating that many of thousands of years are required for enough weathering to develop a soil a few feet thick from a hard rock like granite. Ex.20. Render the text in English. Под действием тепла и холода, воды и живых организмов горные породы разрушается. Днем солнце нагревает горные породы, а вы знаете, что при нагревании тела расширятся. Ночью, наоборот, происходит сильное охлаждение, и породы сжимаются. В результате изменения температур на поверхности пород образуются трещины. В эти трещины попадает вода. При кристаллизации вода расширяется и расширяет трещины. В результате горные породы раскалываются на части. Процесс разрушения горных пород под воздействием внешних сил называется выветриванием. Выветривание может быть связано не только с резким изменением температуры. Минеральный состав пород изменяется в результате взаимодействия между породой и газами воздуха: кислородом, углекислым газом и др. водные растворы тоже воздействуют на горные породы. Растения и животные также выделяют растворы, разрушающие горные породы и минералы. Выветривание представляет собой геологический процесс разрушения пород. Ex.21. Agree or disagree with the following statements and give your reasoning. 1. Weathering is a universal work of atmosphere. 2. Only sedimentary rocks are subjected to weathering. 3. Water is a purely chemical agent of weathering. 4. It is easy to draw a line between mechanical and chemical processes of weathering. 5. Weathering is a surface process. Ex.22. Speak on: 1. The effect of weathering. 2. Mechanical weathering. 3. Chemical weathering. 4. The difference between chemical and mechanical weathering. 5. Agents of weathering.