Section #: 18.3 Volcanoes

Practice Test
      
  1.What is a pyroclastic flow?  
  a.   when lava comes out of a volcanic vent  
  b.   a mixture of volcanic gas, ash, and other tephra  
  c.   poisonous gas of a volcano  
  d.   lava that hardens into a batholith  
  Hint    
      
  2.How was the volcano cone shown in the figure formed?



 
  a.   layer upon layer of basaltic lava accumulating during nonexplosive eruptions  
  b.   material is ejected into the air and falls back to earth  
  c.   a mixture of lava and volcanic fragments  
  d.   uplifting of mountains before exploding into a volcano  
  Hint    
      
  3.What is the name of a large volcanic crater over 1 km in diameter?  
  a.   a stock  
  b.   a caldera  
  c.   a batholith  
  d.   a vent  
  Hint    
      
  4.Where do most volcanoes form?  
  a.   along the Mid-Atlantic Ridge  
  b.   at plate boundaries  
  c.   far from plate boundaries  
  d.   in the southern hemisphere  
  Hint    
      
  5.The table shows how many eruptions were experienced by volcanoes in the past 100,000 years. Which volcano is the least likely to experience a huge eruption in present day?

Feature State Late Pleistocene Holocene
Huge Huge Large Medium Small
Mount Baker WA       1 3
Glacier Peak WA     2   7
Mount Rainier WA 1     1 10
Mount St. Helens WA       7  
Mount Adams WA         4
Mount Hood OR         3
Mount Jefferson OR 1        
Three Sisters OR     2   2
Newberry Caldera OR     1 3  
Crater Lake OR   1 2    
Medicine Lake CA       8 8
Mount Shasta CA 1   2   10
Lassen Peak CA 4   1   2
Total   7 1 10 20 49


 
  a.   Lassen Peak  
  b.   Mount Shasta  
  c.   Mount Hood  
  d.   Mount Rainier  
  Hint    
      
  6.What type of volcano forms from alternating layers of tephra and nonexplosive lava?  
  a.   composite volcano  
  b.   cinder cone  
  c.   caldera  
  d.   shield volcano  
  Hint    
      
  7.What are large, angular fragments thrown from a volcano called?  
  a.   lapilli  
  b.   ash  
  c.   volcanic bombs  
  d.   volcanic blocks  
  Hint    
      
  8.What two things does the appearance of a volcano depend on?  
  a.   type of eruption and latitude  
  b.   type of material and viscosity  
  c.   type of material and eruption  
  d.   type of eruption and temperature of the lava  
  Hint    
      
  9.Volcanoes that form far from plate boundaries form as the result of __________.  
  a.   cinder cones  
  b.   divergent plate boundaries  
  c.   hot spots  
  d.   volcanic bombs  
  Hint    
      
  10.How is a volcanic crater connected to a magma chamber?  
  a.   by a hot spot  
  b.   by a vent  
  c.   by a sill  
  d.   by tephra  
  Hint    
      
  11.Rock fragments thrown into the air during a volcanic eruption are called __________.  
  a.   tephra  
  b.   extrusive  
  c.   granite  
  d.   lava  
  Hint    
      
  12.What is the water content in the magma that fuels the volcano shown in the figure?



 
  a.   more water  
  b.   less water  
  c.   average water  
  d.   water completely absent  
  Hint    

 
   
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