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The Theory of Plate Tectonics
Pages 42-47
4. Describe what happens when:
A. two plates carrying oceanic crust collideB. two plates carrying continental crust collideC. a plate made of oceanic crust collides with a plate carrying continental crust5. Explain what force caused the movement of the continents from one super-continent to their
present positions.
6. What is the theory of plate tectonics?
7. What are the different types of boundaries found along the edges of Earth’s plates?
8. Look at Figure 26 on page 43 and find the divergent boundary that runs through the African
plate. Predict what could eventually happen along this boundary.
Fill in the blank to complete each statement.
9. A scientific ____________________ is a well-tested concept that explains a wide range of
observations.
10. Breaks in Earth’s crust where rocks have slipped past each other are called
____________________.
11. The lithosphere is broken into separate sections called ____________________.
12. A(n) ____________________ is a deep valley on land that forms along a divergent boundary.
13. The geological theory that states that pieces of Earth’s crust are in constant, slow motion is
called ____________________.