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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.   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    
      
  2.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    
      
  3.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 valley formation has nothing to do with normal faults.  
  d.   Rift valleys sometimes occur near normal faults, but their formation is not related to these faults.  
  Hint    
      
  4.What is the lithosphere?  
  a.   the upper part of the mantle  
  b.   the plates that make up the crust and the upper part of the mantle  
  c.   the plates that make up the crust  
  d.   large, flat stones sitting on top of malleable magma  
  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 seafloor spreading.  
  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 continental drift.  
  d.   This evidence proved that new seafloor features are constantly being added due to reversals of Earth's magnetic field.  
  Hint    
      
  6.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    
      
  7.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    
      
  8.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    
      
  9.How do scientists explain the formation of underwater mountain ranges?  
  a.   continental drift  
  b.   seafloor spreading  
  c.   strike-slip faults  
  d.   convection currents  
  Hint    
      
  10.Who first proposed the theory of continental drift?  
  a.   Alfred Wegener  
  b.   Galileo Galilee  
  c.   Albert Einstein  
  d.   Harry Hess  
  Hint    
      
  11.What are strike-slip faults?  
  a.   a boundary where rocks move in the same directions at the same rate  
  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 on opposite sides of the fault move in opposite or the same directions at different rates  
  Hint    
      
  12.How does the Mesosaurus fossil evidence support the continental drift theory?  
  a.   because the Mesosaurus lived millions of years ago, when scientists believe the continents began to drift  
  b.   because it's unlikely that the Mesosaurus could swim between continents  
  c.   because it's unlikely that the Mesosaurus existed on both continents.  
  d.   The Mesosaurus fossil evidence does not support the continental drift theory. It proves it wrong.  
  Hint    
      
  13.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.   cold climates  
  c.   enormous valleys formed by glaciers  
  d.   leftover portions of glaciers  
  Hint    
      
  14.Do two colliding continental plates always cause volcanoes?  
  a.   Yes, subduction always occurs when continental plates collide.  
  b.   Yes, subduction always occurs when oceanic plates collide.  
  c.   No, usually no subduction occurs when continental plates collide.  
  d.   No, earthquakes always occur when two continental plates collide.  
  Hint    
      
  15.What is Pangaea?  
  a.   the largest fault found on Earth  
  b.   the large landmass that all continents are currently forming  
  c.   the large landmass in which all continents once were connected  
  d.   Earth's inner core  
  Hint    
      
  16.What does plate tectonics cause?  
  a.   all answers are correct  
  b.   forms mountains  
  c.   forms ocean basins  
  d.   causes volcanoes  
  Hint    
      
  17.What is a transform boundary?  
  a.   A transform boundary is when two plates collide.  
  b.   A transform boundary is when two plates move toward each other.  
  c.   A transform boundary is when two plates pull away from each other.  
  d.   A transform boundary is when two plates slide past one another.  
  Hint    
      
  18.What do scientists believe is the force behind the plate tectonics theory?  
  a.   convection currents  
  b.   the movement of the planets  
  c.   gravity slab pull  
  d.   the Sun's gravity  
  Hint    
      
  19.What is a magnetic field reversal?  
  a.   when Earth's magnetic field suddenly runs east/west instead of south/north  
  b.   when Earth's magnetic field suddenly disappears for short periods of time  
  c.   when Earth's magnetic field leaves the south pole and enters the north pole  
  d.   when Earth's magnetic field leaves the north pole and enters the south pole  
  Hint    
      
  20.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    

 
   
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