II. Finish the following sentences according to the text.
1) Coal is composed of …
2) The energy in coal comes from the energy …
3) A layer of dead plants was covered by …
4) The rank of a deposit of coal depends on …
5) Bituminous coal contains …
6) …is the lowest rank of coal with the lowest energy content.
7) Lignite coal deposits were not subjected to …
8) Coal miners use giant machines …
9) Surface mining can be used when the coal is buried …
10) Underground mining is used when the coal is buried …
III. Decide whether the following statements are true or false.
1. Coal is inflammable black or brown sedimentary rock.
2. The pressure and heat from the top layers helped the plant remains turn into coal.
3. Bituminous coal formed about 100 to 300 million years ago is at the least widespread rank of coal in the US.
4. Bituminous coal has a higher heating value than subbituminous coal.
5. Lignite is a relatively young coal deposit.
6. Surface mining is cheaper than underground mining.
7. Rocks and dirt, sulfur and unwanted materials are removed from coal at a preparation plant.
8. Coal is burnt by power plants to make steam.
9. Coke is used for smelting iron ore into iron.
10. The strength and flexibility are given to steel by the use of coke.
IV. Combine the words:
| 1) sedimentary | a) plants |
| 2) nonrenewable | b) rock |
| 3) swampy | c) value |
| 4) dead | d) layer |
| 5) top | e) forests |
| 6) plant | f) energy |
| 7) heat | g) energy source |
| 8) heating | h) rank |
| 9) abundant | i) remains |
| 10) raw | j) materials |
| 11) moisture | k) mining |
| 12) deep | l) machines |
| 13) giant | m) reserves |
| 14) coal | n) content |
| 15) iron | o) furnaces |
| 16) hot | p) ore |
V. Answer the questions:
1. Why is coal a nonrenewable energy source?
2. What does the classification of coal depend on?
3. How much carbon does anthracite contain?
4. Do the steel and iron industries use bituminous coal?
5. How much carbon does subbituminous contain?
6. What type of coal is crumbly and has a high moisture content?
7. What are the two methods of mining ?
8. What is done at the plant?
9. When is coal ready to be shipped to market?
10. How is coke made?
Text 3.
I. Read the text and be ready to do exercises that follow it.
Vocabulary
oil [ɔɪl] нефть
|
|
|
crudeoil [kru:d] сырой, неочищенный
plant [plænt] завод
environment [ɪn’vaɪrənmənt] окружающаясреда
smelly [’smelɪ] дурно пахнущий, зловонный
silt [sɪlt] ил, осадок
to explore [ɪk’splɔ:] исследовать
sample [’sæmpəl] образец
measurement [’me ʒərmənt] измерение
to promise [’prɔmɪs] обещать
derrick [’derɪk] деррик-кран, подъемная стрела
hole [həul] дыра
sour [sauə] скисать
remove [rɪ’mu:v] передвигать, перемещать
refinery [rɪ’faɪnərɪ] очистительный завод
employee [‚emplɔɪ’i:] работник, служащий
crayon [kreɪən] цветно́й каранда́ш,
|
|
|
tire [’taɪər] шина, покрышка
petroleum [pə’trəulɪəm] керосин, гудрон, нефть
Oil
Oil was formed from the remains of animals and plants (diatoms) that lived millions of years ago in a water environment before the dinosaurs. Over millions of years, the remains of these animals and plants were covered by layers of sand and silt. Heat and pressure from these layers helped the remains turn into what we today call crude oil (Fig. 1).
Fig. 1
Crude oil is a smelly, yellow-to-black liquid and is usually found in underground areas called reservoirs. Scientists and engineers explore a chosen area by studying rock samples from the earth. Measurements are taken, and, if the site seems promising, drilling begins. Above the hole a derrick is built to house the tools and pipes going into the well. When finished, the drilled well will bring a steady flow of oil to the surface.
Crude oil is called «sweet» when it contains only a small amount of sulfur and «sour» if it contains a lot of sulfur. Crude oil is also classified by the weight of its molecules. «Light» crude oil flows freely like water, while «heavy» crude oil is thick like tar. Crude oil is measured in barrels.
The world's top five crude oil-: producing countries are Russia Saudi Arabia, United States, Iran, China.
After crude oil is removed from the ground, it is sent to a re-finery by pipeline, ship, or barge. A typical refinery costs billions of dollars to build and millions more to maintain. A refinery runs 24 hours a day, 365 days a year and requires a large number of employees to| run it. A refinery can occupy as much land as several hundred football fields.
At a refinery, different parts of the crude oil are separated into useable petroleum products. Essentially, refining breaks crude oil, down into its various components, which then are selectively reconfigured into new products. All refineries perform three basic steps: separation, conversion and treatment.
|
|
|
One barrel of crude oil, when refined, produces about 19 gal-ions of finished motor gasoline, and 10 gallons of diesel, as well as other petroleum products. Most petroleum products are used to produce energy, to move merchandise and people, help make plastics, and do many other things. For instance, many people across the United States use propane to heat their homes.
Other products made from petroleum include ink, crayons, | bubble gum, dishwashing liquids, deodorant, eyeglasses, CDs and DVDs, tires, ammonia, heart valves.
Дата добавления: 2021-01-21; просмотров: 335; Мы поможем в написании вашей работы! |
Мы поможем в написании ваших работ!