Section #: 19.1 Forces Within the Earth

Practice Test
      
  1.Where does an earthquake originate?  
  a.   at Earth's inner core  
  b.   at the P-wave  
  c.   at the focus  
  d.   at the epicenter  
  Hint    
      
  2.What are most earthquakes associated with?  
  a.   plate boundaries  
  b.   rift valleys  
  c.   mid-ocean ridges  
  d.   divergent plate boundaries  
  Hint    
      
  3.__________ causes permanent strain.  
  a.   Tension  
  b.   Compression  
  c.   Ductile deformation  
  d.   Elastic deformation  
  Hint    
      
  4.Which type of fault results in horizontal shortening?  
  a.   shear  
  b.   reverse  
  c.   strike-slip  
  d.   normal  
  Hint    
      
  5.Which type of stress pulls a material apart?  
  a.   strain  
  b.   tension  
  c.   shear  
  d.   compression  
  Hint    
      
  6.__________ push and pull rocks in the same direction along which the waves are traveling.  
  a.   Surface waves  
  b.   Secondary waves  
  c.   Primary waves  
  d.   Shear waves  
  Hint    
      
  7.__________ is the force per unit area acting on a material.  
  a.   Stress  
  b.   Rotation  
  c.   Shear  
  d.   Strain  
  Hint    
      
  8.What does the straight part of a stress-strain graph portray?  
  a.   failure  
  b.   elastic deformation  
  c.   shearing direction  
  d.   ductile deformation  
  Hint    
      
  9.At what point in the graph would a rock be permanently deformed?



 
  a.   at the start of the stress  
  b.   at the elastic limit  
  c.   past the elastic limit  
  d.   at the failure point  
  Hint    

 
   
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