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Plate Tectonics

Practice Test
      
  1.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 the rocks on the seafloor were older than rocks on continents.  
  d.   This evidence proved that new seafloor features are constantly being added due to seafloor spreading.  
  Hint    
      
  2.What happens when an oceanic plate converges with a continental plate?  
  a.   The less dense oceanic plate slides under the denser continental plate.  
  b.   The denser oceanic plate slides under the less dense continental plate.  
  c.   The denser oceanic plate slides on top of the less dense continental plate.  
  d.   The less dense oceanic plate slides past the denser continental plate.  
  Hint    
      
  3.What does plate tectonics cause?  
  a.   forms mountains  
  b.   forms ocean basins  
  c.   causes volcanoes  
  d.   all answers are correct  
  Hint    
      
  4.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 are formed from normal faults.  
  c.   Rift valleys sometimes occur near normal faults, but their formation is not related to these faults.  
  d.   Rift valley formation has nothing to do with normal faults.  
  Hint    
      
  5.Do two colliding continental plates always cause volcanoes?  
  a.   Yes, subduction always occurs when oceanic plates collide.  
  b.   No, earthquakes always occur when two continental plates collide.  
  c.   No, usually no subduction occurs when continental plates collide.  
  d.   Yes, subduction always occurs when continental plates collide.  
  Hint    
      
  6.What happens to rock around a subducting slab?  
  a.   It combines with the other rock.  
  b.   It disappears from Earth.  
  c.   It goes under the other plate.  
  d.   It goes over the other plate.  
  Hint    
      
  7.How can Earth's plates move?  
  a.   They only collide or slide along each other.  
  b.   They can collide, pull apart, or slide against each other.  
  c.   They only converge or diverge.  
  d.   They only can move toward each other.  
  Hint    
      
  8.What is Pangaea?  
  a.   the large landmass that all continents are currently forming  
  b.   the largest fault found on Earth  
  c.   Earth's inner core  
  d.   the large landmass in which all continents once were connected  
  Hint    
      
  9.What evidence proved that South America, Africa, India, and Australia were once covered by glaciers?  
  a.   cold climates  
  b.   leftover portions of glaciers  
  c.   glacial deposits and rock surfaces scarred by glaciers  
  d.   enormous valleys formed by glaciers  
  Hint    
      
  10.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.   Similar rock structures have been found on different continents.  
  d.   all answers are correct  
  Hint    
      
  11.What do scientists believe is the force behind the plate tectonics theory?  
  a.   gravity slab pull  
  b.   convection currents  
  c.   the Sun's gravity  
  d.   the movement of the planets  
  Hint    
      
  12.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 it's unlikely that the Mesosaurus could swim between continents  
  c.   because the Mesosaurus lived millions of years ago, when scientists believe the continents began to drift  
  d.   because it's unlikely that the Mesosaurus existed on both continents.  
  Hint    
      
  13.Who first proposed the theory of continental drift?  
  a.   Harry Hess  
  b.   Alfred Wegener  
  c.   Galileo Galilee  
  d.   Albert Einstein  
  Hint    
      
  14.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    
      
  15.What tool does a scientist use to detect magnetic fields?  
  a.   a fieldometer  
  b.   a magnetogram  
  c.   a magnetometer  
  d.   a thermometer  
  Hint    
      
  16.What are strike-slip faults?  
  a.   a boundary where rocks on opposite sides of the fault move in opposite or the same directions at different rates  
  b.   a boundary where rocks in the fault never move  
  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    
      
  17.How do scientists explain the formation of underwater mountain ranges?  
  a.   seafloor spreading  
  b.   convection currents  
  c.   strike-slip faults  
  d.   continental drift  
  Hint    
      
  18.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 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 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    
      
  19.How can crust disappear at the edge of a boundary?  
  a.   Gravity is pulling it down.  
  b.   It is too dense and is sinking into Earth.  
  c.   The other edge of the boundary is being pulled into Earth's core.  
  d.   because new crust is being added to the other edge of the boundary  
  Hint    
      
  20.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    

 
   
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