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Plate Tectonics

Practice Test
      
  1.What tool does a scientist use to detect magnetic fields?  
  a.   a fieldometer  
  b.   a magnetometer  
  c.   a magnetogram  
  d.   a thermometer  
  Hint    
      
  2.What does plate tectonics cause?  
  a.   all answers are correct  
  b.   forms mountains  
  c.   causes volcanoes  
  d.   forms ocean basins  
  Hint    
      
  3.What is Pangaea?  
  a.   the large landmass that all continents are currently forming  
  b.   Earth's inner core  
  c.   the largest fault found on Earth  
  d.   the large landmass in which all continents once were connected  
  Hint    
      
  4.What clue supported the continental drift theory?  
  a.   all answers are correct  
  b.   Similar rock structures have been found on different continents.  
  c.   Fossils of animals have been found on continents separated by oceans.  
  d.   a puzzle-like fit of all the continents  
  Hint    
      
  5.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 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 seafloor spreading.  
  d.   This evidence proved that the rocks on the seafloor were older than rocks on continents.  
  Hint    
      
  6.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 more shallow the water is.  
  c.   The less time 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 deeper the water is.  
  Hint    
      
  7.What kind of movement created the Himalaya Mountains?  
  a.   reversals of Earth's magnetic field  
  b.   erosion  
  c.   compressional forces  
  d.   divergent boundaries  
  Hint    
      
  8.What is the lithosphere?  
  a.   the plates that make up the crust and the upper part of the mantle  
  b.   large, flat stones sitting on top of malleable magma  
  c.   the plates that make up the crust  
  d.   the upper part of the mantle  
  Hint    
      
  9.What do scientists believe is the force behind the plate tectonics theory?  
  a.   gravity slab pull  
  b.   the movement of the planets  
  c.   the Sun's gravity  
  d.   convection currents  
  Hint    
      
  10.How do scientists explain the formation of underwater mountain ranges?  
  a.   seafloor spreading  
  b.   strike-slip faults  
  c.   continental drift  
  d.   convection currents  
  Hint    
      
  11.What is the difference between normal faults and rift valleys?  
  a.   Rift valley formation has nothing to do with normal faults.  
  b.   Rift valleys are formed from normal faults.  
  c.   Rift valleys sometimes occur near normal faults, but their formation is not related to these faults.  
  d.   Normal faults occur in the northern hemisphere, but rift valleys only occur in the southern hemisphere.  
  Hint    
      
  12.What is the continental drift theory?  
  a.   the belief that continents are moving slowly together from their current locations on Earth  
  b.   the belief that continents have always been located at their current locations on Earth  
  c.   the belief that continents have quickly moved apart to their current locations on Earth  
  d.   the belief that continents have moved slowly apart to their current locations on Earth  
  Hint    
      
  13.Who first proposed the theory of continental drift?  
  a.   Albert Einstein  
  b.   Alfred Wegener  
  c.   Galileo Galilee  
  d.   Harry Hess  
  Hint    
      
  14.A divergent boundary is a boundary between two plates that __________.  
  a.   converge  
  b.   move toward each other  
  c.   slide along each other  
  d.   move away from each other  
  Hint    
      
  15.How does the Mesosaurus fossil evidence support the continental drift theory?  
  a.   The Mesosaurus fossil evidence does not support the continental drift theory. It proves it wrong.  
  b.   because the Mesosaurus lived millions of years ago, when scientists believe the continents began to drift  
  c.   because it's unlikely that the Mesosaurus could swim between continents  
  d.   because it's unlikely that the Mesosaurus existed on both continents.  
  Hint    
      
  16.What happens to rock around a subducting slab?  
  a.   It goes under the other plate.  
  b.   It disappears from Earth.  
  c.   It goes over the other plate.  
  d.   It combines with the other rock.  
  Hint    
      
  17.Do two colliding continental plates always cause volcanoes?  
  a.   Yes, subduction always occurs when continental plates collide.  
  b.   No, usually no subduction occurs when continental plates collide.  
  c.   No, earthquakes always occur when two continental plates collide.  
  d.   Yes, subduction always occurs when oceanic plates collide.  
  Hint    
      
  18.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.   because new crust is being added to the other edge of the boundary  
  c.   It is too dense and is sinking into Earth.  
  d.   Gravity is pulling it down.  
  Hint    
      
  19.What is a magnetic field reversal?  
  a.   when Earth's magnetic field leaves the south pole and enters the north pole  
  b.   when Earth's magnetic field leaves the north pole and enters the south pole  
  c.   when Earth's magnetic field suddenly runs east/west instead of south/north  
  d.   when Earth's magnetic field suddenly disappears for short periods of time  
  Hint    
      
  20.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    

 
   
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