Complete the following short description of mountain building. Scan the text once more.
Date: 2015-10-07; view: 623.
Match the definitions with the correct term.
Find the synonyms to the following words
EXERCISES
Colliding continents
Cordilleran belt orogeny
a. island-arc (c) and continent (d) with offshore sediments (b) advance on two plates, one subducting below the other.
b. collision squeezes and rucks up sediments (b) between island-arc volcanoes (c) and continent (d), producing a ñordilleran mountain chain such as the Andes.
c/d. the subduction zone is replaced by a new one.
a. continents (d) advance on separate plates
b. collision rucks up marginal sediments (b) and the ocean shrinks.
c. the oceanic crust between is subducted and the two continents collide, forming mountain ranges like the Alps / the Himalayas
(Lambert “The Field Guide to Geology” 1988, Cambridge University Press)
| 1. collide | a. dry up |
| 2. disrupt | b. join |
| 3. weld | c. compress |
| 4. sweep (against) | d. appear |
| 5. squeeze | e. pile up |
| 6. bob (up) | f. destroy |
| 7. ruck (up) | g. move |
| 8. shrink | h. clash |
| 1. ranges | a. mighty slabs of alien rock |
| 2. mountain systems | b. mountain building |
| 3. orogenesis | c. mountains created by crustal deformation and uplift |
| 4. orogen | d. chains and ranges |
| 5. terranes | e. mountains occurring in rows |
Orogenesis is the term used to describe (1) ______________. Orogenesis takes place where (2) _______________ plates disrupt the continental crust. Such mountain belts are known as (3) ______________. They are mountain belts created by (4) _____________ and (5) __________. Geologically orogenic belts usually (6) ________ continents. Mountain building is a very complex process. Troughs of (7) ________________ offshore sediments, volcanic rocks, are swept (8) _____________ one continent and then (9) __________ on as mountain (10) ____________.
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| Island-arc orogeny | | | INFORMATIVE READING: How continents evolve |