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Plate Tectonics

Practice Test
      
  1.What is a magnetic field reversal?  
  a.   when Earth's magnetic field leaves the north pole and enters the south pole  
  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 suddenly disappears for short periods of time  
  Hint    
      
  2.Why was the discovery of no rocks older than 2 billion years old on the ocean floor so important?  
  a.   This evidence proved that new seafloor features are constantly being added due to continental drift.  
  b.   This evidence proved that the rocks on the seafloor were older than rocks on continents.  
  c.   This evidence proved that new seafloor features are constantly being added due to reversals of Earth's magnetic field.  
  d.   This evidence proved that new seafloor features are constantly being added due to seafloor spreading.  
  Hint    
      
  3.What happens to rock around a subducting slab?  
  a.   It goes under the other plate.  
  b.   It goes over the other plate.  
  c.   It combines with the other rock.  
  d.   It disappears from Earth.  
  Hint    
      
  4.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    
      
  5.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 colder the water is.  
  b.   The longer it takes a sound wave to return to the ship, the deeper 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    
      
  6.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 Earth's crust and upper mantle is broken into sections  
  d.   the belief that continents have moved slowly apart to their current locations on Earth  
  Hint    
      
  7.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.   cold climates  
  d.   glacial deposits and rock surfaces scarred by glaciers  
  Hint    
      
  8.What does plate tectonics cause?  
  a.   all answers are correct  
  b.   forms mountains  
  c.   forms ocean basins  
  d.   causes volcanoes  
  Hint    
      
  9.Who first proposed the theory of continental drift?  
  a.   Harry Hess  
  b.   Albert Einstein  
  c.   Galileo Galilee  
  d.   Alfred Wegener  
  Hint    
      
  10.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.   Rift valleys are formed from normal faults.  
  c.   Normal faults occur in the northern hemisphere, but rift valleys only occur in the southern hemisphere.  
  d.   Rift valley formation has nothing to do with normal faults.  
  Hint    
      
  11.What is Pangaea?  
  a.   the large landmass in which all continents once were connected  
  b.   Earth's inner core  
  c.   the large landmass that all continents are currently forming  
  d.   the largest fault found on Earth  
  Hint    
      
  12.What are strike-slip faults?  
  a.   a boundary where rocks in the fault never move  
  b.   a boundary where rocks on opposite sides of the fault move in opposite or the same directions at different rates  
  c.   a boundary where rocks on the same side of the fault move in the same direction, but at different rates  
  d.   a boundary where rocks move in the same directions at the same rate  
  Hint    
      
  13.How do scientists explain the formation of underwater mountain ranges?  
  a.   strike-slip faults  
  b.   seafloor spreading  
  c.   continental drift  
  d.   convection currents  
  Hint    
      
  14.What happens when an oceanic plate converges with a continental plate?  
  a.   The denser oceanic plate slides on top of the less dense continental plate.  
  b.   The less dense oceanic plate slides under the denser continental plate.  
  c.   The less dense oceanic plate slides past the denser continental plate.  
  d.   The denser oceanic plate slides under the less dense continental plate.  
  Hint    
      
  15.Do two colliding continental plates always cause volcanoes?  
  a.   No, earthquakes always occur when two continental plates collide.  
  b.   No, usually no subduction occurs when continental plates collide.  
  c.   Yes, subduction always occurs when continental plates collide.  
  d.   Yes, subduction always occurs when oceanic plates collide.  
  Hint    
      
  16.What do scientists believe is the force behind the plate tectonics theory?  
  a.   the movement of the planets  
  b.   convection currents  
  c.   the Sun's gravity  
  d.   gravity slab pull  
  Hint    
      
  17.What clue supported the continental drift theory?  
  a.   Fossils of animals have been found on continents separated by oceans.  
  b.   Similar rock structures have been found on different continents.  
  c.   a puzzle-like fit of all the continents  
  d.   all answers are correct  
  Hint    
      
  18.What kind of movement created the Himalaya Mountains?  
  a.   reversals of Earth's magnetic field  
  b.   compressional forces  
  c.   divergent boundaries  
  d.   erosion  
  Hint    
      
  19.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 quickly moved apart to their current locations on Earth  
  c.   the belief that continents have moved slowly apart to their current locations on Earth  
  d.   the belief that continents are moving slowly together from their current locations on Earth  
  Hint    
      
  20.How can Earth's plates move?  
  a.   They can collide, pull apart, or slide against each other.  
  b.   They only collide or slide along each other.  
  c.   They only can move toward each other.  
  d.   They only converge or diverge.  
  Hint    

 
   
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