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Plate Tectonics

Practice Test
      
  1.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    
      
  2.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    
      
  3.What happens to rock around a subducting slab?  
  a.   It combines with the other rock.  
  b.   It disappears from Earth.  
  c.   It goes over the other plate.  
  d.   It goes under the other plate.  
  Hint    
      
  4.How can Earth's plates move?  
  a.   They can collide, pull apart, or slide against each other.  
  b.   They only can move toward each other.  
  c.   They only collide or slide along each other.  
  d.   They only converge or diverge.  
  Hint    
      
  5.Do two colliding continental plates always cause volcanoes?  
  a.   No, usually no subduction occurs when continental plates collide.  
  b.   Yes, subduction always occurs when continental plates collide.  
  c.   Yes, subduction always occurs when oceanic plates collide.  
  d.   No, earthquakes always occur when two continental plates collide.  
  Hint    
      
  6.What is the lithosphere?  
  a.   large, flat stones sitting on top of malleable magma  
  b.   the plates that make up the crust and the upper part of the mantle  
  c.   the upper part of the mantle  
  d.   the plates that make up the crust  
  Hint    
      
  7.What does plate tectonics cause?  
  a.   causes volcanoes  
  b.   forms ocean basins  
  c.   forms mountains  
  d.   all answers are correct  
  Hint    
      
  8.What tool does a scientist use to detect magnetic fields?  
  a.   a magnetogram  
  b.   a thermometer  
  c.   a magnetometer  
  d.   a fieldometer  
  Hint    
      
  9.What kind of movement created the Himalaya Mountains?  
  a.   reversals of Earth's magnetic field  
  b.   erosion  
  c.   divergent boundaries  
  d.   compressional forces  
  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.How do scientists explain the formation of underwater mountain ranges?  
  a.   continental drift  
  b.   convection currents  
  c.   seafloor spreading  
  d.   strike-slip faults  
  Hint    
      
  12.What is the difference between normal faults and rift valleys?  
  a.   Normal faults occur in the northern hemisphere, but rift valleys only occur in the southern hemisphere.  
  b.   Rift valleys sometimes occur near normal faults, but their formation is not related to these faults.  
  c.   Rift valley formation has nothing to do with normal faults.  
  d.   Rift valleys are formed from normal faults.  
  Hint    
      
  13.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    
      
  14.What clue supported the continental drift theory?  
  a.   Similar rock structures have been found on different continents.  
  b.   Fossils of animals have been found on continents separated by oceans.  
  c.   all answers are correct  
  d.   a puzzle-like fit of all the continents  
  Hint    
      
  15.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    
      
  16.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    
      
  17.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    
      
  18.What is a transform boundary?  
  a.   A transform boundary is when two plates move toward each other.  
  b.   A transform boundary is when two plates pull away from each other.  
  c.   A transform boundary is when two plates slide past one another.  
  d.   A transform boundary is when two plates collide.  
  Hint    
      
  19.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 north pole and enters the south pole  
  d.   when Earth's magnetic field leaves the south pole and enters the north pole  
  Hint    
      
  20.How can crust disappear at the edge of a boundary?  
  a.   Gravity is pulling it down.  
  b.   The other edge of the boundary is being pulled into Earth's core.  
  c.   It is too dense and is sinking into Earth.  
  d.   because new crust is being added to the other edge of the boundary  
  Hint    

 
   
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