Earthquakes

Practice Test
      
  1.When is wind-transported material deposited?  
  a.   when the particles break apart  
  b.   when the wind slows  
  c.   when the wind becomes stronger  
  d.   when the wind changes direction  
      
  2.The map shows where the continents are likely to move in the next 50 million years. The shaded area represents their present position. According to the data on this map, what kind of boundary is found between the Americas and Africa?



 
  a.   subduction  
  b.   divergent  
  c.   convergent  
  d.   transform  
      
  3.__________ causes permanent strain.  
  a.   Ductile deformation  
  b.   Compression  
  c.   Elastic deformation  
  d.   Tension  
      
  4.How are the convection currents set in motion?  
  a.   the heat from radioactive decay  
  b.   slab push and ridge pull  
  c.   spreading mid-ocean ridges  
  d.   slab push  
      
  5.Rock fragments thrown into the air during a volcanic eruption are called __________.  
  a.   granite  
  b.   lava  
  c.   extrusive  
  d.   tephra  
      
  6.What type of instrument can measure the vibrations of an earthquake?  
  a.   seismograph  
  b.   GPS  
  c.   sonar  
  d.   seismometer  
      
  7.A large ocean wave that is generated by vertical motions of the seafloor during an earthquake is called a(n) __________.  
  a.   seiche  
  b.   tidal range  
  c.   upwelling current  
  d.   tsunami  
      
  8.What is thought to be the driving mechanism of plate movement?  
  a.   volcanoes  
  b.   continental drifting  
  c.   conduction of heat in the mantle  
  d.   convection currents in the mantle  
      
  9.Which wave arrives at a seismic facility first?  
  a.   surface wave  
  b.   P-wave  
  c.   tidal wave  
  d.   S-wave  
      
  10.Where do tectonic plates interact?  
  a.   in deep-sea trenches  
  b.   at plate centers  
  c.   at plate boundaries  
  d.   at mid-ocean ridges  
      
  11.What is a surface that has only large particles because the wind has removed the finer particles?  
  a.   abraded  
  b.   loess  
  c.   a desert pavement  
  d.   a dune  
      
  12.What is the probability of earthquake occurrence based on?  
  a.   location of foci  
  b.   reoccurrence rates of earthquakes in an area and the rate of strain buildup  
  c.   magnitude of P-waves  
  d.   strain buildup only  
      
  13.According to the graph, what is the approximate depth range of ocean basins?



 
  a.   6 km to 8 km  
  b.   8 km to 10 km  
  c.   1 km to 4 km  
  d.   2 km to 4 km  
      
  14.What is the water content in the magma that fuels the volcano shown in the figure?



 
  a.   more water  
  b.   average water  
  c.   less water  
  d.   water completely absent  
      
  15.How does a Landsat satellite differentiate between objects on Earth's surface?  
  a.   Landsat satellites take pictures using visible light.  
  b.   Landsat measures the longest frequencies of electromagnetic radiation from Earth.  
  c.   Features on Earth radiate warmth at different frequencies, which show up as different colors on Landsat images.  
  d.   Landsat uses a single detector to measure the intensities of energy.  
      
  16.How many times larger is a magnitude 3 than a magnitude 1 earthquake on the Richter scale?  
  a.   10 times  
  b.   1/10 times  
  c.   100 000 times  
  d.   100 times  
      
  17.What does GPS stand for?  
  a.   Global Positioning System  
  b.   Geodial Position Satellite  
  c.   Global Potential Satellite  
  d.   Geographic Positioning System  
      
  18.Why are three circles needed to determine the epicenter, as shown in the figure?

 
  a.   The epicenter can move.  
  b.   If only two circles are used, there are two possible locations.  
  c.   The more measurements, the better.  
  d.   Scientists always take measurements in threes.  
      
  19.__________ is the force per unit area acting on a material.  
  a.   Strain  
  b.   Shear  
  c.   Stress  
  d.   Rotation  
      
  20.What breaks mid-ocean ridges into smaller sections?  
  a.   shelf breaks  
  b.   abyssal plains  
  c.   fracture zones  
  d.   submarine canyons  

 
   
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