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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 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 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 colder the water is.  
  Hint    
      
  2.What kind of movement created the Himalaya Mountains?  
  a.   divergent boundaries  
  b.   reversals of Earth's magnetic field  
  c.   compressional forces  
  d.   erosion  
  Hint    
      
  3.How can Earth's plates move?  
  a.   They can collide, pull apart, or slide against each other.  
  b.   They only collide or slide along each other.  
  c.   They only can move toward each other.  
  d.   They only converge or diverge.  
  Hint    
      
  4.What evidence proved that South America, Africa, India, and Australia were once covered by glaciers?  
  a.   enormous valleys formed by glaciers  
  b.   glacial deposits and rock surfaces scarred by glaciers  
  c.   leftover portions of glaciers  
  d.   cold climates  
  Hint    
      
  5.A divergent boundary is a boundary between two plates that __________.  
  a.   move toward each other  
  b.   move away from each other  
  c.   converge  
  d.   slide along each other  
  Hint    
      
  6.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.   Fossils of animals have been found on continents separated by oceans.  
  d.   all answers are correct  
  Hint    
      
  7.What happens when an oceanic plate converges with a continental plate?  
  a.   The denser oceanic plate slides under the less dense continental plate.  
  b.   The less dense oceanic plate slides past the denser continental plate.  
  c.   The less dense oceanic plate slides under the denser continental plate.  
  d.   The denser oceanic plate slides on top of the less dense continental plate.  
  Hint    
      
  8.How can crust disappear at the edge of a boundary?  
  a.   because new crust is being added to the other edge of the boundary  
  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.   Gravity is pulling it down.  
  Hint    
      
  9.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 valley formation has nothing to do with normal faults.  
  c.   Rift valleys are formed from normal faults.  
  d.   Rift valleys sometimes occur near normal faults, but their formation is not related to these faults.  
  Hint    
      
  10.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 moved slowly apart to 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 are moving slowly together from their current locations on Earth  
  Hint    
      
  11.What is the lithosphere?  
  a.   the plates that make up the crust and the upper part of the mantle  
  b.   the plates that make up the crust  
  c.   large, flat stones sitting on top of malleable magma  
  d.   the upper part of the mantle  
  Hint    
      
  12.How do scientists explain the formation of underwater mountain ranges?  
  a.   strike-slip faults  
  b.   continental drift  
  c.   seafloor spreading  
  d.   convection currents  
  Hint    
      
  13.What do scientists believe is the force behind the plate tectonics theory?  
  a.   the Sun's gravity  
  b.   gravity slab pull  
  c.   convection currents  
  d.   the movement of the planets  
  Hint    
      
  14.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    
      
  15.What is Pangaea?  
  a.   the large landmass in which all continents once were connected  
  b.   the largest fault found on Earth  
  c.   Earth's inner core  
  d.   the large landmass that all continents are currently forming  
  Hint    
      
  16.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    
      
  17.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 continents have moved slowly apart to their current locations on Earth  
  d.   the belief that hot, less dense material is forced up through Earth's crust through mid-ocean ridges  
  Hint    
      
  18.What tool does a scientist use to detect magnetic fields?  
  a.   a magnetogram  
  b.   a magnetometer  
  c.   a thermometer  
  d.   a fieldometer  
  Hint    
      
  19.Do two colliding continental plates always cause volcanoes?  
  a.   No, earthquakes always occur when two continental plates collide.  
  b.   Yes, subduction always occurs when oceanic plates collide.  
  c.   No, usually no subduction occurs when continental plates collide.  
  d.   Yes, subduction always occurs when continental plates collide.  
  Hint    
      
  20.What are strike-slip faults?  
  a.   a boundary where rocks move in the same directions at the same rate  
  b.   a boundary where rocks on opposite sides of the fault move in opposite or the same directions at different rates  
  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 in the fault never move  
  Hint    

 
   
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