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Chapter 15: The Moving Continents

Practice Test
  1.Which of the following is made of material that is lowest in density?  
  a.   core  
  b.   oceanic crust  
  c.   mantle  
  d.   continental crust  
  2.Which is the outermost layer of Earth?  
  a.   skin  
  b.   core  
  c.   crust  
  d.   mantle  
  3.Special deposits of rock can be found where Africa, India, Australia, and South America were once joined. These deposits suggest a colder climate than is currently present at these locations. What do scientists suggest deposited these rocks?  
  a.   lakes  
  b.   streams  
  c.   glaciers  
  d.   oceans  
  4.Which puttylike layer is located just beneath Earth's plates?  
  a.   oceanic crust  
  b.   lithosphere  
  c.   outer core  
  d.   asthenosphere  
  5.How have scientists learned about the deep interior of Earth beneath the crust?  
  a.   They have analyzed seismic waves that have passed through Earth's interior.  
  b.   They have sampled rock from mines located deep in the mantle.  
  c.   They have drilled deep cores that penetrate through the center of Earth.  
  d.   all of the above  
  6.Where does separation of oceanic crust occur, and where is new ocean floor created?  
  a.   convergent boundaries  
  b.   mid-ocean ridges  
  c.   the Himalaya  
  d.   trenches  
  7.What is the origin of movement of lithospheric plates? In other words, what powers plate tectonics?  
  a.   subduction  
  b.   conduction  
  c.   convection  
  d.   divergence  
  8.What are mountain chains thousands of kilometers long on the ocean floor known as?  
  a.   rift valleys  
  b.   mid-ocean ridges  
  c.   hot spots  
  d.   trenches  
  9.In which layer are convection cells moving, and in turn, driving the movement of lithospheric plates?  
  a.   trench  
  b.   continental crust  
  c.   oceanic crust  
  d.   mantle  
  10.What happens to a portion of a plate when it is forced below another plate?  
  a.   It separates to form a rift valley.  
  b.   It reverses in magnetic polarity.  
  c.   It partially melts to form magma.  
  d.   It forms a divergent boundary.  
  11.What evidence did Wegener suggest that supported the hypothesis of continental drift?  
  a.   the locations of Glossopteris fossils  
  b.   the locations of Mesosaurus fossils  
  c.   the puzzle-like fit of the continents  
  d.   All of the above.  
  12.How do plates move along transform boundaries?  
  a.   They collide head on into one another.  
  b.   They move away from one another.  
  c.   They move past one another in opposite directions or in the same direction at different rates.  
  d.   They are forced together to form trenches.  
  13.The lithosphere, which makes up Earth's plates, is composed of what two layers?  
  a.   asthenosphere and crust  
  b.   asthenosphere and upper mantle  
  c.   oceanic crust and lower mantle  
  d.   crust and upper mantle  
  14.Which of the following occurs along convergent boundaries?  
  a.   volcanoes  
  b.   trenches  
  c.   mountains  
  d.   all of the above  
  15.How did the Hawaiian Islands form?  
  a.   The Pacific plate was forced under another plate.  
  b.   The Pacific plate was split apart.  
  c.   The Pacific plate collided with the Eurasian plate to form mountains.  
  d.   The Pacific plate moved over a hot spot.  

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