Geography. Козлова Е.П. - 34 стр.

7.4 Say whether the following statements are true or false

1. The earth is a spheroid flattened at the poles.
2. The axis on which the earth rotates is longer by 27 miles than the equatorial
   diameter.
3. The hydrosphere includes all bodies of water in liquid state.
4. The lower boundary of the crust is 20-25 miles beneath the ocean and only about
   4 miles beneath the surface of the continents.
5. Materials the mantle composed of, are much denser than those making up the
   crust.
6. The temperature of the outer core may be as high as that at the surface of the sun.
7. All naturally radioactive elements are known to change finally into lead.

7.5 Fill in the blanks with the suitable words from the text

1. ………. makes up only 0.02 per cent of the mass of the earth.
2. ………. is composed of materials much denser than those making up the crust.
3. The atmosphere, the hydrosphere and the lithosphere are the ………. layers of the
  earth.
4. The earth is not a true ………. but a ………. .
5. The discovery of ………. gave the scientists a new means of estimating ………. of
   the earth.
6. ………. includes the rocks of the continents as well as the rocks beneath the ocean
    floor.
7. The continents are made up of ………. covered by a thin layer of ……, and
    underlain by ………. .

7.6 Complete the following sentences

1. Compared with quite an ordinary star, like the sun, the earth ………. .
2. By measuring the amount of lead present in rocks containing uranium we can
   ………. .
3. The atmosphere, the outermost layer, is ………. .
4. The floor of the ocean basins is mostly underlain by………. .
5. The mantle is believed to consist of ………. .
6. The oldest rock so far discovered has been dated at ………. .
7. One gram of uranium will yield ………. .

7.7 Translate into English

1. Атмосфера, гидросфера и литосфера – это внешние оболочки Земли.
2. Атмосфера – воздушная оболочка Земли, гидросфера – водная оболочка
   Земли, литосфера – земная кора + часть мантии.
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