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Practice Test
  1.A volcanic neck is the remains of a(n) ___________.  
  a.   active volcano  
  b.   magma flow  
  c.   intrusive igneous rock  
  d.   eroded volcano  
  2.Sulfurous gases emitted by volcanoes __________.  
  a.   are contained totally within lava flows  
  b.   can mix with water vapor and form acid rain  
  c.   help plants grow  
  d.   are good for the environment  
  3.Granitic magma eruptions are  
  a.   quiet  
  b.   explosive  
  c.   slow  
  d.   fluid  
  4.What two factors control the explosiveness of an eruption?  
  a.   the amount of gases and pressure within Earth's crust  
  b.   the pressure within Earth and plate movement  
  c.   the time of year and current weather conditions  
  d.   the amount of water vapor and silica in the magma  
  5.Volcanoes often are found in areas on Earth where __________.  
  a.   plates fit together perfectly  
  b.   mountains are found  
  c.   rivers are found  
  d.   plates collide  
  6.Islands like Iceland are often formed due to __________.  
  a.   cooling lava flows  
  b.   plate movement  
  c.   all answers are correct  
  d.   rifts in the Earth's surface  
  7.Intrusive igneous rock bodies such as batholiths and sills form when __________.  
  a.   an earthquake occurs  
  b.   a volcano erupts  
  c.   magma solidifies underground  
  d.   lava solidifies on Earth's surface  
  8.Intrusive igneous rocks are those which __________.  
  a.   cool on Earth's surface  
  b.   cool beneath Earth's surface  
  c.   changed over time from one type of rock to another  
  d.   are composed of sediments found in flood beds  
  9.Calderas form __________.  
  a.   continually  
  b.   after an eruption  
  c.   before an eruption  
  d.   during an eruption  
  10.Shield volcanoes are the result of __________.  
  a.   basaltic and andesitic lava flows  
  b.   andesitic lava flows  
  c.   basaltic lava flows  
  d.   granitic lava flows  
  11.What is a vent?  
  a.   the remains of an eroded volcano  
  b.   a small fissure on the side of a volcano  
  c.   the steep depression around a volcano's opening  
  d.   the opening in a volcano  
  12.A volcano is an opening in Earth that erupts__________.  
  a.   all answers are correct  
  b.   ash  
  c.   lava  
  d.   gases  
  13.Of the three types of volcanoes, which is the least explosive?  
  a.   composite volcanoes  
  b.   shield volcanoes  
  c.   They all have the same level of explosiveness.  
  d.   cinder volcanoes  
  14.The difference between basaltic and granitic magma is __________.  
  a.   the color  
  b.   the amount of silica  
  c.   the way it cools  
  d.   the amount of water vapor  
  15.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.  
  16.What is the difference between lava and magma?  
  a.   They originate from different places.  
  b.   They are made of different types of rock.  
  c.   After magma reaches the surface it's called lava.  
  d.   They are different colors.  
  17.What are batholiths?  
  a.   hot magma flows that cool quickly before they reach Earth's surface  
  b.   magma bodies that cool slowly before they reach Earth's surface  
  c.   magma bodies that cool quickly before they reach Earth's surface  
  d.   hot magma flows that cool slowly before they reach Earth's surface  
  18.What causes magma to rise to the surface?  
  a.   Magma is more dense than rock.  
  b.   A force pulls the magma upward.  
  c.   Magma is less dense than rock.  
  d.   The rock forces the magma upward.  
  19.A pyroclastic flow is__________.  
  a.   a type of lava flow  
  b.   another form of precipitation  
  c.   hot volcanic ash and debris that rushes down the side of a volcano  
  d.   an opening in the side of a volcano  
  20.High levels of silica causes magma to become __________.  
  a.   more fluid  
  b.   thinner  
  c.   thicker  
  d.   less dense  

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