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  
  2.__________ causes permanent strain.  
  a.   Tension  
  b.   Compression  
  c.   Ductile deformation  
  d.   Elastic deformation  
  3.Which type of fault results in horizontal shortening?  
  a.   shear  
  b.   reverse  
  c.   strike-slip  
  d.   normal  
  4.What does the straight part of a stress-strain graph portray?  
  a.   failure  
  b.   elastic deformation  
  c.   shearing direction  
  d.   ductile deformation  
  5.__________ is the force per unit area acting on a material.  
  a.   Stress  
  b.   Rotation  
  c.   Shear  
  d.   Strain  
  6.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  
  7.What are most earthquakes associated with?  
  a.   plate boundaries  
  b.   rift valleys  
  c.   mid-ocean ridges  
  d.   divergent plate boundaries  
  8.Which type of stress pulls a material apart?  
  a.   strain  
  b.   tension  
  c.   shear  
  d.   compression  
  9.__________ 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  

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