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Plate Tectonics

Practice Test
      
  1.How can Earth's plates move?  
  a.   They only collide or slide along each other.  
  b.   They only converge or diverge.  
  c.   They can collide, pull apart, or slide against each other.  
  d.   They only can move toward each other.  
  Hint    
      
  2.How do scientists use sound waves to figure out the shape of the ocean floor?  
  a.   The longer it takes a sound wave to return to the ship, the deeper the water is.  
  b.   The longer it takes a sound wave to return to the ship, the colder the water is.  
  c.   The longer it takes a sound wave to return to the ship, the more shallow the water is.  
  d.   The less time it takes a sound wave to return to the ship, the deeper the water is.  
  Hint    
      
  3.What happens when an oceanic plate converges with a continental plate?  
  a.   The less dense oceanic plate slides under the denser continental plate.  
  b.   The denser oceanic plate slides on top of the less dense continental plate.  
  c.   The denser oceanic plate slides under the less dense continental plate.  
  d.   The less dense oceanic plate slides past the denser continental plate.  
  Hint    
      
  4.What kind of movement created the Himalaya Mountains?  
  a.   erosion  
  b.   divergent boundaries  
  c.   compressional forces  
  d.   reversals of Earth's magnetic field  
  Hint    
      
  5.What evidence proved that South America, Africa, India, and Australia were once covered by glaciers?  
  a.   enormous valleys formed by glaciers  
  b.   leftover portions of glaciers  
  c.   glacial deposits and rock surfaces scarred by glaciers  
  d.   cold climates  
  Hint    
      
  6.How can crust disappear at the edge of a boundary?  
  a.   It is too dense and is sinking into Earth.  
  b.   Gravity is pulling it down.  
  c.   because new crust is being added to the other edge of the boundary  
  d.   The other edge of the boundary is being pulled into Earth's core.  
  Hint    
      
  7.What is a transform boundary?  
  a.   A transform boundary is when two plates collide.  
  b.   A transform boundary is when two plates move toward each other.  
  c.   A transform boundary is when two plates pull away from each other.  
  d.   A transform boundary is when two plates slide past one another.  
  Hint    
      
  8.How do scientists explain the formation of underwater mountain ranges?  
  a.   strike-slip faults  
  b.   continental drift  
  c.   seafloor spreading  
  d.   convection currents  
  Hint    
      
  9.What is Pangaea?  
  a.   the large landmass in which all continents once were connected  
  b.   the largest fault found on Earth  
  c.   Earth's inner core  
  d.   the large landmass that all continents are currently forming  
  Hint    
      
  10.What tool does a scientist use to detect magnetic fields?  
  a.   a fieldometer  
  b.   a magnetogram  
  c.   a magnetometer  
  d.   a thermometer  
  Hint    
      
  11.What are strike-slip faults?  
  a.   a boundary where rocks move in the same directions at the same rate  
  b.   a boundary where rocks on the same side of the fault move in the same direction, but at different rates  
  c.   a boundary where rocks in the fault never move  
  d.   a boundary where rocks on opposite sides of the fault move in opposite or the same directions at different rates  
  Hint    
      
  12.What is the plate tectonic theory?  
  a.   the belief that hot, less dense material is forced up through Earth's crust through mid-ocean ridges  
  b.   the belief that Earth is broken into sections that fit together into one sphere  
  c.   the belief that continents have moved slowly apart to their current locations on Earth  
  d.   the belief that Earth's crust and upper mantle is broken into sections  
  Hint    
      
  13.What happens to rock around a subducting slab?  
  a.   It disappears from Earth.  
  b.   It goes under the other plate.  
  c.   It combines with the other rock.  
  d.   It goes over the other plate.  
  Hint    
      
  14.What is the difference between normal faults and rift valleys?  
  a.   Rift valleys sometimes occur near normal faults, but their formation is not related to these faults.  
  b.   Normal faults occur in the northern hemisphere, but rift valleys only occur in the southern hemisphere.  
  c.   Rift valleys are formed from normal faults.  
  d.   Rift valley formation has nothing to do with normal faults.  
  Hint    
      
  15.What clue supported the continental drift theory?  
  a.   Fossils of animals have been found on continents separated by oceans.  
  b.   a puzzle-like fit of all the continents  
  c.   Similar rock structures have been found on different continents.  
  d.   all answers are correct  
  Hint    
      
  16.Who first proposed the theory of continental drift?  
  a.   Albert Einstein  
  b.   Alfred Wegener  
  c.   Galileo Galilee  
  d.   Harry Hess  
  Hint    
      
  17.What is a magnetic field reversal?  
  a.   when Earth's magnetic field suddenly disappears for short periods of time  
  b.   when Earth's magnetic field suddenly runs east/west instead of south/north  
  c.   when Earth's magnetic field leaves the south pole and enters the north pole  
  d.   when Earth's magnetic field leaves the north pole and enters the south pole  
  Hint    
      
  18.What do scientists believe is the force behind the plate tectonics theory?  
  a.   gravity slab pull  
  b.   convection currents  
  c.   the movement of the planets  
  d.   the Sun's gravity  
  Hint    
      
  19.Why was the discovery of no rocks older than 2 billion years old on the ocean floor so important?  
  a.   This evidence proved that the rocks on the seafloor were older than rocks on continents.  
  b.   This evidence proved that new seafloor features are constantly being added due to continental drift.  
  c.   This evidence proved that new seafloor features are constantly being added due to seafloor spreading.  
  d.   This evidence proved that new seafloor features are constantly being added due to reversals of Earth's magnetic field.  
  Hint    
      
  20.What is the continental drift theory?  
  a.   the belief that continents have always been located at their current locations on Earth  
  b.   the belief that continents have moved slowly apart to their current locations on Earth  
  c.   the belief that continents are moving slowly together from their current locations on Earth  
  d.   the belief that continents have quickly moved apart to their current locations on Earth  
  Hint    

 
   
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