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Plate Tectonics

Practice Test
      
  1.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 leaves the south pole and enters the north pole  
  c.   when Earth's magnetic field suddenly disappears for short periods of time  
  d.   when Earth's magnetic field leaves the north pole and enters the south pole  
  Hint    
      
  2.What tool does a scientist use to detect magnetic fields?  
  a.   a thermometer  
  b.   a fieldometer  
  c.   a magnetometer  
  d.   a magnetogram  
  Hint    
      
  3.What clue supported the continental drift theory?  
  a.   all answers are correct  
  b.   a puzzle-like fit of all the continents  
  c.   Fossils of animals have been found on continents separated by oceans.  
  d.   Similar rock structures have been found on different continents.  
  Hint    
      
  4.Do two colliding continental plates always cause volcanoes?  
  a.   No, earthquakes always occur when two continental plates collide.  
  b.   No, usually no subduction occurs when continental plates collide.  
  c.   Yes, subduction always occurs when continental plates collide.  
  d.   Yes, subduction always occurs when oceanic plates collide.  
  Hint    
      
  5.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 can move toward each other.  
  d.   They only converge or diverge.  
  Hint    
      
  6.A divergent boundary is a boundary between two plates that __________.  
  a.   converge  
  b.   slide along each other  
  c.   move toward each other  
  d.   move away from each other  
  Hint    
      
  7.What kind of movement created the Himalaya Mountains?  
  a.   erosion  
  b.   reversals of Earth's magnetic field  
  c.   compressional forces  
  d.   divergent boundaries  
  Hint    
      
  8.What is the plate tectonic theory?  
  a.   the belief that Earth's crust and upper mantle is broken into sections  
  b.   the belief that continents have moved slowly apart to their current locations on Earth  
  c.   the belief that Earth is broken into sections that fit together into one sphere  
  d.   the belief that hot, less dense material is forced up through Earth's crust through mid-ocean ridges  
  Hint    
      
  9.What is the lithosphere?  
  a.   the plates that make up the crust  
  b.   the upper part of the mantle  
  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    
      
  10.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.   leftover portions of glaciers  
  d.   enormous valleys formed by glaciers  
  Hint    
      
  11.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    
      
  12.What is the continental drift theory?  
  a.   the belief that continents have quickly moved apart to 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 are moving slowly together from their current locations on Earth  
  d.   the belief that continents have moved slowly apart to their current locations on Earth  
  Hint    
      
  13.What are strike-slip faults?  
  a.   a boundary where rocks in the fault never move  
  b.   a boundary where rocks move in the same directions at the same rate  
  c.   a boundary where rocks on opposite sides of the fault move in opposite or the same directions at different rates  
  d.   a boundary where rocks on the same side of the fault move in the same direction, but at different rates  
  Hint    
      
  14.What is the difference between normal faults and rift valleys?  
  a.   Rift valleys are formed from normal faults.  
  b.   Rift valleys sometimes occur near normal faults, but their formation is not related to these faults.  
  c.   Rift valley formation has nothing to do with normal faults.  
  d.   Normal faults occur in the northern hemisphere, but rift valleys only occur in the southern hemisphere.  
  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 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    
      
  16.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 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 continental drift.  
  d.   This evidence proved that the rocks on the seafloor were older than rocks on continents.  
  Hint    
      
  17.What does plate tectonics cause?  
  a.   all answers are correct  
  b.   causes volcanoes  
  c.   forms mountains  
  d.   forms ocean basins  
  Hint    
      
  18.Who first proposed the theory of continental drift?  
  a.   Galileo Galilee  
  b.   Alfred Wegener  
  c.   Harry Hess  
  d.   Albert Einstein  
  Hint    
      
  19.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 more shallow 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 deeper the water is.  
  d.   The less time it takes a sound wave to return to the ship, the deeper the water is.  
  Hint    
      
  20.How do scientists explain the formation of underwater mountain ranges?  
  a.   convection currents  
  b.   continental drift  
  c.   strike-slip faults  
  d.   seafloor spreading  
  Hint    

 
   
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