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Volcanoes

Practice Test
      
  1.The difference between basaltic and granitic magma is __________.  
  a.   the amount of silica  
  b.   the color  
  c.   the amount of water vapor  
  d.   the way it cools  
  Hint    
      
  2.Volcanoes often are found in areas on Earth where __________.  
  a.   mountains are found  
  b.   plates fit together perfectly  
  c.   plates collide  
  d.   rivers are found  
  Hint    
      
  3.A pyroclastic flow is__________.  
  a.   hot volcanic ash and debris that rushes down the side of a volcano  
  b.   another form of precipitation  
  c.   a type of lava flow  
  d.   an opening in the side of a volcano  
  Hint    
      
  4.Sulfurous gases emitted by volcanoes __________.  
  a.   are contained totally within lava flows  
  b.   help plants grow  
  c.   can mix with water vapor and form acid rain  
  d.   are good for the environment  
  Hint    
      
  5.Shield volcanoes are the result of __________.  
  a.   basaltic and andesitic lava flows  
  b.   andesitic lava flows  
  c.   basaltic lava flows  
  d.   granitic lava flows  
  Hint    
      
  6.What causes magma to rise to the surface?  
  a.   A force pulls the magma upward.  
  b.   Magma is less dense than rock.  
  c.   Magma is more dense than rock.  
  d.   The rock forces the magma upward.  
  Hint    
      
  7.Magma originates in which layer of Earth?  
  a.   inner core  
  b.   crust  
  c.   mantle  
  d.   core  
  Hint    
      
  8.Calderas form __________.  
  a.   continually  
  b.   during an eruption  
  c.   before an eruption  
  d.   after an eruption  
  Hint    
      
  9.High levels of silica causes magma to become __________.  
  a.   more fluid  
  b.   thinner  
  c.   less dense  
  d.   thicker  
  Hint    
      
  10.What is the difference between a dike and a sill?  
  a.   Dikes are formed across vertical cracks, and sills are formed across horizontal ones.  
  b.   They form in the same direction, but they are created differently.  
  c.   They form in the same direction, but are of different sizes.  
  d.   Dikes are formed across horizontal cracks, and sills are formed across vertical ones.  
  Hint    
      
  11.Convergent plate boundaries __________.  
  a.   force one plate beneath Earth's surface  
  b.   spread apart Earth's surface  
  c.   create volcanoes that are not as violent as others  
  d.   don't produce volcanoes  
  Hint    
      
  12.What is a vent?  
  a.   the opening in a volcano  
  b.   the steep depression around a volcano's opening  
  c.   a small fissure on the side of a volcano  
  d.   the remains of an eroded volcano  
  Hint    
      
  13.A volcano is an opening in Earth that erupts__________.  
  a.   lava  
  b.   gases  
  c.   ash  
  d.   all answers are correct  
  Hint    
      
  14.Intrusive igneous rock bodies such as batholiths and sills form when __________.  
  a.   lava solidifies on Earth's surface  
  b.   magma solidifies underground  
  c.   an earthquake occurs  
  d.   a volcano erupts  
  Hint    
      
  15.Of the three types of volcanoes, which is the least explosive?  
  a.   cinder volcanoes  
  b.   shield volcanoes  
  c.   composite volcanoes  
  d.   They all have the same level of explosiveness.  
  Hint    
      
  16.What are batholiths?  
  a.   hot magma flows that cool quickly before they reach Earth's surface  
  b.   hot magma flows that cool slowly before they reach Earth's surface  
  c.   magma bodies that cool slowly before they reach Earth's surface  
  d.   magma bodies that cool quickly before they reach Earth's surface  
  Hint    
      
  17.Intrusive igneous rocks are those which __________.  
  a.   cool beneath Earth's surface  
  b.   cool on Earth's surface  
  c.   are composed of sediments found in flood beds  
  d.   changed over time from one type of rock to another  
  Hint    
      
  18.The Hawaiian Islands are formed because of __________.  
  a.   subduction  
  b.   converging plates  
  c.   hot spots  
  d.   diverging plates  
  Hint    
      
  19.What is the difference between lava and magma?  
  a.   After magma reaches the surface it's called lava.  
  b.   They are made of different types of rock.  
  c.   They are different colors.  
  d.   They originate from different places.  
  Hint    
      
  20.A volcanic neck is the remains of a(n) ___________.  
  a.   active volcano  
  b.   magma flow  
  c.   eroded volcano  
  d.   intrusive igneous rock  
  Hint    

 
   
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