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Plate Tectonics

Practice Test
      
  1.How can crust disappear at the edge of a boundary?  
  a.   Gravity is pulling it down.  
  b.   because new crust is being added to the other edge of the boundary  
  c.   It is too dense and is sinking into Earth.  
  d.   The other edge of the boundary is being pulled into Earth's core.  
  Hint    
      
  2.How do scientists explain the formation of underwater mountain ranges?  
  a.   continental drift  
  b.   convection currents  
  c.   strike-slip faults  
  d.   seafloor spreading  
  Hint    
      
  3.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 leaves the north pole and enters the south pole  
  c.   when Earth's magnetic field leaves the south pole and enters the north pole  
  d.   when Earth's magnetic field suddenly runs east/west instead of south/north  
  Hint    
      
  4.Who first proposed the theory of continental drift?  
  a.   Albert Einstein  
  b.   Galileo Galilee  
  c.   Alfred Wegener  
  d.   Harry Hess  
  Hint    
      
  5.How does the Mesosaurus fossil evidence support the continental drift theory?  
  a.   because it's unlikely that the Mesosaurus existed on both 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 could swim between continents  
  Hint    
      
  6.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    
      
  7.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 seafloor spreading.  
  b.   This evidence proved that new seafloor features are constantly being added due to reversals of Earth's magnetic field.  
  c.   This evidence proved that new seafloor features are constantly being added due to continental drift.  
  d.   This evidence proved that the rocks on the seafloor were older than rocks on continents.  
  Hint    
      
  8.What do scientists believe is the force behind the plate tectonics theory?  
  a.   the Sun's gravity  
  b.   convection currents  
  c.   the movement of the planets  
  d.   gravity slab pull  
  Hint    
      
  9.What is the plate tectonic theory?  
  a.   the belief that Earth is broken into sections that fit together into one sphere  
  b.   the belief that continents have moved slowly apart to their current locations on Earth  
  c.   the belief that hot, less dense material is forced up through Earth's crust through mid-ocean ridges  
  d.   the belief that Earth's crust and upper mantle is broken into sections  
  Hint    
      
  10.What is Pangaea?  
  a.   the largest fault found on Earth  
  b.   Earth's inner core  
  c.   the large landmass that all continents are currently forming  
  d.   the large landmass in which all continents once were connected  
  Hint    
      
  11.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.   enormous valleys formed by glaciers  
  c.   cold climates  
  d.   leftover portions of glaciers  
  Hint    
      
  12.What are strike-slip faults?  
  a.   a boundary where rocks on the same side of the fault move in the same direction, but at different rates  
  b.   a boundary where rocks move in the same directions at the same rate  
  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    
      
  13.What happens to rock around a subducting slab?  
  a.   It goes under the other plate.  
  b.   It combines with the other rock.  
  c.   It goes over the other plate.  
  d.   It disappears from Earth.  
  Hint    
      
  14.What is a transform boundary?  
  a.   A transform boundary is when two plates collide.  
  b.   A transform boundary is when two plates slide past one another.  
  c.   A transform boundary is when two plates pull away from each other.  
  d.   A transform boundary is when two plates move toward each other.  
  Hint    
      
  15.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 less time 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 longer it takes a sound wave to return to the ship, the colder the water is.  
  Hint    
      
  16.What kind of movement created the Himalaya Mountains?  
  a.   erosion  
  b.   divergent boundaries  
  c.   compressional forces  
  d.   reversals of Earth's magnetic field  
  Hint    
      
  17.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 converge or diverge.  
  d.   They only collide or slide along each other.  
  Hint    
      
  18.A divergent boundary is a boundary between two plates that __________.  
  a.   move away from each other  
  b.   move toward each other  
  c.   slide along each other  
  d.   converge  
  Hint    
      
  19.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.   all answers are correct  
  d.   Similar rock structures have been found on different continents.  
  Hint    
      
  20.What happens when an oceanic plate converges with a continental plate?  
  a.   The less dense oceanic plate slides past the denser continental plate.  
  b.   The less dense oceanic plate slides under the denser continental plate.  
  c.   The denser oceanic plate slides on top of the less dense continental plate.  
  d.   The denser oceanic plate slides under the less dense continental plate.  
  Hint    

 
   
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