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Chapter 11: The Rock Cycle

Practice Test
      
  1.How do igneous rocks form?  
  a.   as molten material cools and solidifies  
  b.   as crystalline material melts  
  c.   as water evaporates from a salty solution  
  d.   as sand grains are compressed at Earth's surface  
  Hint    
      
  2.A stream flows through a mountainous area and plucks off grains of granite along the way. The chunks of granite are carried by the stream until the flowing water can hold them no longer and they drop to the bottom of a deep pool. Which part of the rock cycle does this activity represent?  
  a.   weathering and erosion of metamorphic rock to form new metamorphic rocks  
  b.   compaction and cementation to form new sediments  
  c.   compaction and pressure to form new metamorphic rocks  
  d.   weathering and erosion of igneous rock to form new sediments  
  Hint    
      
  3.What is the first step in the formation of a detrital sedimentary rock?  
  a.   cementation of mineral grains and rock fragments  
  b.   melting of mineral grains and rock fragments  
  c.   compaction of mineral grains and rock fragments  
  d.   weathering and erosion of mineral  
  Hint    
      
  4.What information about the geologic history of an area can be gained from fossils?  
  a.   the relative ages of rocks  
  b.   the features of once-living organisms  
  c.   compaction of mineral grains and rock fragments  
  d.   all of the above  
  Hint    
      
  5.Select the BEST definition of a rock.  
  a.   a mixture of one or more minerals, mineraloids, glass, or organic materials  
  b.   a mixture of quartz, mica, hornblende, and feldspar  
  c.   a mixture of halite and calcite  
  d.   a mixture of organic remains and synthetic materials  
  Hint    
      
  6.How can heat and pressure change the appearance of mineral grains during the formation of a metamorphic rock?  
  a.   They may flatten and line up.  
  b.   They may melt to form glass.  
  c.   They may dissolve and form a geode.  
  d.   They may weather to clay.  
  Hint    
      
  7.Granite is a mixture of interlocked minerals formed from cooling magma. Which of the following minerals is NOT a major component of granite?  
  a.   quartz  
  b.   halite  
  c.   mica  
  d.   feldspar  
  Hint    
      
  8.Select the most common extrusive igneous rock.  
  a.   obsidian  
  b.   basalt  
  c.   granite  
  d.   chert  
  Hint    
      
  9.Which is true of intrusive rocks?  
  a.   They form as magma cools and solidifies below Earth's surface.  
  b.   They form as water dissolves minerals below Earth's surface.  
  c.   They form as lava cools and solidifies above Earth's surface.  
  d.   They form as water wears away minerals on Earth's surface.  
  Hint    
      
  10.The white cliffs of Dover are composed of which rock type?  
  a.   detrital sedimentary  
  b.   foliated metamorphic  
  c.   extrusive igneous  
  d.   organic sedimentary  
  Hint    
      
  11.How are igneous rocks classified?  
  a.   by luster and hardness  
  b.   by grain roundness and hardness  
  c.   by grain size and overall color  
  d.   by hardness and abundance  
  Hint    
      
  12.How are metamorphic rocks classified by texture?  
  a.   as heated or pressurized  
  b.   as foliated or nonfoliated  
  c.   as intrusive or extrusive  
  d.   as detrital or organic  
  Hint    
      
  13.How is concrete different from conglomerate?  
  a.   Concrete is igneous and conglomerate is sedimentary.  
  b.   Concrete is grainy and conglomerate is smooth.  
  c.   Concrete is a solid and conglomerate is a sediment.  
  d.   Concrete is human-made and conglomerate forms in nature.  
  Hint    
      
  14.What physical property of obsidian makes it useful as a tool?  
  a.   its rapid cooling rate  
  b.   the way it fractures  
  c.   its glassy luster  
  d.   its streak  
  Hint    
      
  15.Which type of rock forms as a result of volcanic activity?  
  a.   extrusive  
  b.   evaporite  
  c.   detrital  
  d.   intrusive  
  Hint    

 
   
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