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3.1 After-reading tasks.

3.1.1. Look through the text and pick out the terms, which have the following definition.

  1. to include / to be part of

  2. stress that pulls a solid body apart

  3. to fill up

  4. a lump

  5. insertion of sedimentary material into a crack

  6. horizontal normal separation

  7. downward movement

  8. part of the continental crust above sea level

  9. oceanic crust forms along the Mid-oceanic ridge and spreads out laterally

  10. subsurface water is transported toward the surface

3.1.2. Compose sentences, using the following words and phrases

1.to creep outward

6. to plug

2. to subside

7. to be tugged apart

3. to thin away

8. to stick

4. to rise from beneath

9. to sink

5. to well up

10. to create

3.1.3. Spreading ridge evolves several stages. Put the words according to the stages. Compose sentences to describe the process. (r.P – 8.1.2, 8.1.3)

Stage 1

Stage 2

Stage 3

Stage 4

mantle

new

rise through

molten

upwelling

blocks

rock

plug

melt

subside

molten

gap

partly

cracks

cracks

rock

oceanic

crustal

block

pull apart

crust

fresh

rim

old

push up

appear

plate

tension

above

bulging

crust

subside

block

central

3.1.4. Put the facts in the correct order which shows how sea floor spreading develops.

1. Fresh cracks appear.

2. Mantle upwells.

3. It partly melts.

4. Molten rock plugs gaps.

5. Tension pulls old crust apart.

6. New crustal blocks subside.

7. Mantle pushes up the oceanic crust.

8. Molten rock rises through cracks.

9. Bulging plate splits.

10. The process is repeated.

11. A central block subsides.

4. Listening comprehension

You will hear part of a radio report about the oceanic crust. For statements 1-12, complete the notes, which summarize what the speaker says. You will need to write a word or short phrase in each sentence. You will hear the recording twice.

  1. The oceanic crust is different from_______________________.

  2. Besides aluminum and calcium, ocean crust has a high content of_______________.

  3. The combination is called ____________________.

  4. The ocean crust has _____________________.

  5. The first layer consists of __________________________.

  6. They may be _______________________, which lie up on ________________.

  7. The next layer is mainly _____________________, which is found at ___________________________.

  8. The third layer is made up of _____________________.

  9. While the last layer is ________________________.

  10. It is made up of peridotite, chiefly __________________.

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