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Plate Tectonics

Practice Test
      
  1.How does the Mesosaurus fossil evidence support the continental drift theory?  
  a.   because it's unlikely that the Mesosaurus existed on both continents.  
  b.   The Mesosaurus fossil evidence does not support the continental drift theory. It proves it wrong.  
  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 could swim between continents  
  Hint    
      
  2.A divergent boundary is a boundary between two plates that __________.  
  a.   move toward each other  
  b.   converge  
  c.   move away from each other  
  d.   slide along each other  
  Hint    
      
  3.What tool does a scientist use to detect magnetic fields?  
  a.   a fieldometer  
  b.   a magnetogram  
  c.   a magnetometer  
  d.   a thermometer  
  Hint    
      
  4.How do scientists explain the formation of underwater mountain ranges?  
  a.   seafloor spreading  
  b.   continental drift  
  c.   convection currents  
  d.   strike-slip faults  
  Hint    
      
  5.How can Earth's plates move?  
  a.   They only can move toward each other.  
  b.   They only collide or slide along each other.  
  c.   They only converge or diverge.  
  d.   They can collide, pull apart, or slide against each other.  
  Hint    
      
  6.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 on opposite sides of the fault move in opposite or the same directions at different rates  
  c.   a boundary where rocks move in the same directions at the same rate  
  d.   a boundary where rocks in the fault never move  
  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 the rocks on the seafloor were older than rocks on continents.  
  b.   This evidence proved that new seafloor features are constantly being added due to seafloor spreading.  
  c.   This evidence proved that new seafloor features are constantly being added due to reversals of Earth's magnetic field.  
  d.   This evidence proved that new seafloor features are constantly being added due to continental drift.  
  Hint    
      
  8.What is a transform boundary?  
  a.   A transform boundary is when two plates move toward each other.  
  b.   A transform boundary is when two plates collide.  
  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    
      
  9.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    
      
  10.What is the lithosphere?  
  a.   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 plates that make up the crust and the upper part of the mantle  
  Hint    
      
  11.What kind of movement created the Himalaya Mountains?  
  a.   reversals of Earth's magnetic field  
  b.   erosion  
  c.   divergent boundaries  
  d.   compressional forces  
  Hint    
      
  12.What does plate tectonics cause?  
  a.   forms ocean basins  
  b.   all answers are correct  
  c.   forms mountains  
  d.   causes volcanoes  
  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.   enormous valleys formed by glaciers  
  c.   leftover portions of glaciers  
  d.   cold climates  
  Hint    
      
  14.How do scientists use sound waves to figure out the shape of the ocean floor?  
  a.   The less time 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 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    
      
  15.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 disappears for short periods of time  
  d.   when Earth's magnetic field suddenly runs east/west instead of south/north  
  Hint    
      
  16.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.   No, earthquakes always occur when two continental plates collide.  
  d.   Yes, subduction always occurs when oceanic plates collide.  
  Hint    
      
  17.What clue supported the continental drift theory?  
  a.   Similar rock structures have been found on different continents.  
  b.   all answers are correct  
  c.   Fossils of animals have been found on continents separated by oceans.  
  d.   a puzzle-like fit of all the continents  
  Hint    
      
  18.Who first proposed the theory of continental drift?  
  a.   Galileo Galilee  
  b.   Albert Einstein  
  c.   Alfred Wegener  
  d.   Harry Hess  
  Hint    
      
  19.What do scientists believe is the force behind the plate tectonics theory?  
  a.   the movement of the planets  
  b.   gravity slab pull  
  c.   the Sun's gravity  
  d.   convection currents  
  Hint    
      
  20.What is the plate tectonic theory?  
  a.   the belief that hot, less dense material is forced up through Earth's crust through mid-ocean ridges  
  b.   the belief that Earth's crust and upper mantle is broken into sections  
  c.   the belief that Earth is broken into sections that fit together into one sphere  
  d.   the belief that continents have moved slowly apart to their current locations on Earth  
  Hint    

 
   
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