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Plate Tectonics

Practice Test
      
  1.How do scientists use sound waves to figure out the shape of the ocean floor?  
  a.   The less time 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 deeper the water is.  
  d.   The longer it takes a sound wave to return to the ship, the more shallow the water is.  
  Hint    
      
  2.What is a transform boundary?  
  a.   A transform boundary is when two plates slide past one another.  
  b.   A transform boundary is when two plates move toward each other.  
  c.   A transform boundary is when two plates collide.  
  d.   A transform boundary is when two plates pull away from each other.  
  Hint    
      
  3.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    
      
  4.What clue supported the continental drift theory?  
  a.   a puzzle-like fit of all the continents  
  b.   Similar rock structures have been found on different continents.  
  c.   all answers are correct  
  d.   Fossils of animals have been found on continents separated by oceans.  
  Hint    
      
  5.What tool does a scientist use to detect magnetic fields?  
  a.   a magnetogram  
  b.   a thermometer  
  c.   a fieldometer  
  d.   a magnetometer  
  Hint    
      
  6.What is the plate tectonic theory?  
  a.   the belief that Earth's crust and upper mantle is broken into sections  
  b.   the belief that Earth is broken into sections that fit together into one sphere  
  c.   the belief that hot, less dense material is forced up through Earth's crust through mid-ocean ridges  
  d.   the belief that continents have moved slowly apart to their current locations on Earth  
  Hint    
      
  7.What do scientists believe is the force behind the plate tectonics theory?  
  a.   convection currents  
  b.   gravity slab pull  
  c.   the Sun's gravity  
  d.   the movement of the planets  
  Hint    
      
  8.What is a magnetic field reversal?  
  a.   when Earth's magnetic field suddenly runs east/west instead of south/north  
  b.   when Earth's magnetic field leaves the north pole and enters the south pole  
  c.   when Earth's magnetic field suddenly disappears for short periods of time  
  d.   when Earth's magnetic field leaves the south pole and enters the north pole  
  Hint    
      
  9.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 past the denser continental plate.  
  c.   The denser oceanic plate slides under the less dense continental plate.  
  d.   The less dense oceanic plate slides under the denser continental plate.  
  Hint    
      
  10.A divergent boundary is a boundary between two plates that __________.  
  a.   slide along each other  
  b.   move toward each other  
  c.   converge  
  d.   move away from each other  
  Hint    
      
  11.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 seafloor spreading.  
  c.   This evidence proved that new seafloor features are constantly being added due to continental drift.  
  d.   This evidence proved that new seafloor features are constantly being added due to reversals of Earth's magnetic field.  
  Hint    
      
  12.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 are moving slowly together from their current locations on Earth  
  d.   the belief that continents have moved slowly apart to their current locations on Earth  
  Hint    
      
  13.What evidence proved that South America, Africa, India, and Australia were once covered by glaciers?  
  a.   glacial deposits and rock surfaces scarred by glaciers  
  b.   leftover portions of glaciers  
  c.   enormous valleys formed by glaciers  
  d.   cold climates  
  Hint    
      
  14.How can crust disappear at the edge of a boundary?  
  a.   The other edge of the boundary is being pulled into Earth's core.  
  b.   It is too dense and is sinking into Earth.  
  c.   because new crust is being added to the other edge of the boundary  
  d.   Gravity is pulling it down.  
  Hint    
      
  15.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 valley formation has nothing to do with normal faults.  
  c.   Normal faults occur in the northern hemisphere, but rift valleys only occur in the southern hemisphere.  
  d.   Rift valleys are formed from normal faults.  
  Hint    
      
  16.What is Pangaea?  
  a.   Earth's inner core  
  b.   the large landmass in which all continents once were connected  
  c.   the large landmass that all continents are currently forming  
  d.   the largest fault found on Earth  
  Hint    
      
  17.What kind of movement created the Himalaya Mountains?  
  a.   compressional forces  
  b.   divergent boundaries  
  c.   reversals of Earth's magnetic field  
  d.   erosion  
  Hint    
      
  18.What happens to rock around a subducting slab?  
  a.   It combines with the other rock.  
  b.   It goes over the other plate.  
  c.   It goes under the other plate.  
  d.   It disappears from Earth.  
  Hint    
      
  19.How does the Mesosaurus fossil evidence support the continental drift theory?  
  a.   because it's unlikely that the Mesosaurus could swim between continents  
  b.   because the Mesosaurus lived millions of years ago, when scientists believe the continents began to drift  
  c.   The Mesosaurus fossil evidence does not support the continental drift theory. It proves it wrong.  
  d.   because it's unlikely that the Mesosaurus existed on both continents.  
  Hint    
      
  20.How do scientists explain the formation of underwater mountain ranges?  
  a.   seafloor spreading  
  b.   continental drift  
  c.   convection currents  
  d.   strike-slip faults  
  Hint    

 
   
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