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Practice Test
  1.Magma originates in which layer of Earth?  
  a.   core  
  b.   inner core  
  c.   mantle  
  d.   crust  
  2.Granitic magma eruptions are  
  a.   quiet  
  b.   slow  
  c.   explosive  
  d.   fluid  
  3.What are batholiths?  
  a.   hot magma flows that cool slowly before they reach Earth's surface  
  b.   magma bodies that cool slowly before they reach Earth's surface  
  c.   hot magma flows that cool quickly before they reach Earth's surface  
  d.   magma bodies that cool quickly before they reach Earth's surface  
  4.What causes magma to rise to the surface?  
  a.   A force pulls the magma upward.  
  b.   Magma is more dense than rock.  
  c.   Magma is less dense than rock.  
  d.   The rock forces the magma upward.  
  5.Cinder cone volcanic eruptions are ___________.  
  a.   explosive and throw lava high into the air  
  b.   gradual and pour lava over the edges, which collects in pools  
  c.   gradual and pour tephra over the edges  
  d.   slow and occur over long periods of time  
  6.What is the difference between lava and magma?  
  a.   They are different colors.  
  b.   They are made of different types of rock.  
  c.   After magma reaches the surface it's called lava.  
  d.   They originate from different places.  
  7.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  
  8.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.  
  9.What two factors control the explosiveness of an eruption?  
  a.   the amount of water vapor and silica in the magma  
  b.   the time of year and current weather conditions  
  c.   the pressure within Earth and plate movement  
  d.   the amount of gases and pressure within Earth's crust  
  10.Intrusive igneous rock bodies such as batholiths and sills form when __________.  
  a.   magma solidifies underground  
  b.   a volcano erupts  
  c.   lava solidifies on Earth's surface  
  d.   an earthquake occurs  
  11.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  
  12.Intrusive igneous rocks are those which __________.  
  a.   cool beneath Earth's surface  
  b.   changed over time from one type of rock to another  
  c.   are composed of sediments found in flood beds  
  d.   cool on Earth's surface  
  13.What is a vent?  
  a.   a small fissure on the side of a volcano  
  b.   the opening in a volcano  
  c.   the remains of an eroded volcano  
  d.   the steep depression around a volcano's opening  
  14.Volcanoes often are found in areas on Earth where __________.  
  a.   mountains are found  
  b.   plates collide  
  c.   rivers are found  
  d.   plates fit together perfectly  
  15.Sulfurous gases emitted by volcanoes __________.  
  a.   are good for the environment  
  b.   can mix with water vapor and form acid rain  
  c.   are contained totally within lava flows  
  d.   help plants grow  
  16.High levels of silica causes magma to become __________.  
  a.   less dense  
  b.   more fluid  
  c.   thinner  
  d.   thicker  
  17.What is the difference between a dike and a sill?  
  a.   They form in the same direction, but they are created differently.  
  b.   Dikes are formed across horizontal cracks, and sills are formed across vertical ones.  
  c.   Dikes are formed across vertical cracks, and sills are formed across horizontal ones.  
  d.   They form in the same direction, but are of different sizes.  
  18.Islands like Iceland are often formed due to __________.  
  a.   rifts in the Earth's surface  
  b.   plate movement  
  c.   all answers are correct  
  d.   cooling lava flows  
  19.A pyroclastic flow is__________.  
  a.   an opening in the side of a volcano  
  b.   a type of lava flow  
  c.   another form of precipitation  
  d.   hot volcanic ash and debris that rushes down the side of a volcano  
  20.Shield volcanoes are the result of __________.  
  a.   basaltic and andesitic lava flows  
  b.   andesitic lava flows  
  c.   basaltic lava flows  
  d.   granitic lava flows  

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