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Volcanoes

Practice Test
      
  1.Convergent plate boundaries __________.  
  a.   don't produce volcanoes  
  b.   force one plate beneath Earth's surface  
  c.   create volcanoes that are not as violent as others  
  d.   spread apart Earth's surface  
  Hint    
      
  2.Cinder cone volcanic eruptions are ___________.  
  a.   gradual and pour lava over the edges, which collects in pools  
  b.   gradual and pour tephra over the edges  
  c.   slow and occur over long periods of time  
  d.   explosive and throw lava high into the air  
  Hint    
      
  3.Intrusive igneous rock bodies such as batholiths and sills form when __________.  
  a.   an earthquake occurs  
  b.   magma solidifies underground  
  c.   a volcano erupts  
  d.   lava solidifies on Earth's surface  
  Hint    
      
  4.The difference between basaltic and granitic magma is __________.  
  a.   the way it cools  
  b.   the amount of water vapor  
  c.   the amount of silica  
  d.   the color  
  Hint    
      
  5.Volcanoes often are found in areas on Earth where __________.  
  a.   plates fit together perfectly  
  b.   plates collide  
  c.   mountains are found  
  d.   rivers are found  
  Hint    
      
  6.Islands like Iceland are often formed due to __________.  
  a.   all answers are correct  
  b.   plate movement  
  c.   cooling lava flows  
  d.   rifts in the Earth's surface  
  Hint    
      
  7.What is the difference between a dike and a sill?  
  a.   They form in the same direction, but are of different sizes.  
  b.   They form in the same direction, but they are created differently.  
  c.   Dikes are formed across horizontal cracks, and sills are formed across vertical ones.  
  d.   Dikes are formed across vertical cracks, and sills are formed across horizontal ones.  
  Hint    
      
  8.A volcanic neck is the remains of a(n) ___________.  
  a.   active volcano  
  b.   intrusive igneous rock  
  c.   eroded volcano  
  d.   magma flow  
  Hint    
      
  9.A pyroclastic flow is__________.  
  a.   another form of precipitation  
  b.   a type of lava flow  
  c.   hot volcanic ash and debris that rushes down the side of a volcano  
  d.   an opening in the side of a volcano  
  Hint    
      
  10.High levels of silica causes magma to become __________.  
  a.   more fluid  
  b.   thinner  
  c.   thicker  
  d.   less dense  
  Hint    
      
  11.A volcano is an opening in Earth that erupts__________.  
  a.   ash  
  b.   gases  
  c.   all answers are correct  
  d.   lava  
  Hint    
      
  12.What two factors control the explosiveness of an eruption?  
  a.   the time of year and current weather conditions  
  b.   the amount of water vapor and silica in the magma  
  c.   the pressure within Earth and plate movement  
  d.   the amount of gases and pressure within Earth's crust  
  Hint    
      
  13.Calderas form __________.  
  a.   before an eruption  
  b.   after an eruption  
  c.   during an eruption  
  d.   continually  
  Hint    
      
  14.Composite volcanoes are found mostly where ___________.  
  a.   Earth's plates come together and one plate sinks beneath the other  
  b.   hot spots in the mantle occur  
  c.   Earth's plates pull apart  
  d.   rifts in Earth's surface occur  
  Hint    
      
  15.What are batholiths?  
  a.   hot magma flows that cool quickly before they reach Earth's surface  
  b.   magma bodies that cool quickly before they reach Earth's surface  
  c.   hot magma flows that cool slowly before they reach Earth's surface  
  d.   magma bodies that cool slowly before they reach Earth's surface  
  Hint    
      
  16.Sulfurous gases emitted by volcanoes __________.  
  a.   help plants grow  
  b.   are contained totally within lava flows  
  c.   are good for the environment  
  d.   can mix with water vapor and form acid rain  
  Hint    
      
  17.Granitic magma eruptions are  
  a.   explosive  
  b.   quiet  
  c.   fluid  
  d.   slow  
  Hint    
      
  18.What causes magma to rise to the surface?  
  a.   A force pulls the magma upward.  
  b.   The rock forces the magma upward.  
  c.   Magma is more dense than rock.  
  d.   Magma is less dense than rock.  
  Hint    
      
  19.Magma originates in which layer of Earth?  
  a.   core  
  b.   crust  
  c.   inner core  
  d.   mantle  
  Hint    
      
  20.Intrusive igneous rocks are those which __________.  
  a.   cool on Earth's surface  
  b.   are composed of sediments found in flood beds  
  c.   cool beneath Earth's surface  
  d.   changed over time from one type of rock to another  
  Hint    

 
   
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