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Chapter 16: Geologic Time

Practice Test
      
  1.Which era is known as the age of dinosaurs and for the occurrence of the first mammals?  
  a.   Mesozoic  
  b.   Precambrian  
  c.   Cenozoic  
  d.   Paleozoic  
  Hint    
      
  2.What is a fossil?  
  a.   a winged organism  
  b.   an imprint of a shell in plaster of paris  
  c.   the remains or trace of an organism that was once alive  
  d.   a thin layer of sediment  
  Hint    
      
  3.Which of the following organisms lived on Earth approximately 2 billion years ago?  
  a.   cats  
  b.   fish  
  c.   bacteria  
  d.   humans  
  Hint    
      
  4.Why do hard parts of organisms aid fossil formation?  
  a.   Hard parts are less likely to decompose.  
  b.   Hard parts are less likely to be eaten.  
  c.   Hard parts are less likely to be broken.  
  d.   all of the above  
  Hint    
      
  5.How do fossils form by replacement?  
  a.   Sediment fills in a shell and hardens.  
  b.   An imprint of an organism is left behind in mud.  
  c.   An organism falls into a tar pit and solidifies.  
  d.   Water moves through an organism, depositing minerals in its place.  
  Hint    
      
  6.What is missing in a sequence of rock that contains an unconformity?  
  a.   some sandstone  
  b.   part of the area's geologic history  
  c.   the top layer of rock  
  d.   older volcanic rocks  
  Hint    
      
  7.A geologist finds a sequence of rock layers. She notices that a layer of limestone has a formation of granite that cuts through it. Which rock is older?  
  a.   It is not possible to determine which rock is older.  
  b.   the granite  
  c.   the limestone  
  d.   The granite and the limestone are the same age.  
  Hint    
      
  8.Why is the record of geologic history most complete in the Cenozoic era?  
  a.   Cenozoic rocks have experienced the most plate tectonic activity.  
  b.   Cenozoic rocks have the most organisms.  
  c.   Cenozoic rocks contain the most igneous rocks.  
  d.   Cenozoic rocks are young and have not been subject to as much erosion or other geologic changes as older rocks have.  
  Hint    
      
  9.Which of the following can cause an unconformity?  
  a.   lack of deposition of rock in an area  
  b.   rock uplifted by an earthquake  
  c.   Cenozoic rocks contain the most igneous rocks.  
  d.   all of the above  
  Hint    
      
  10.What conditions favor the preservation of a fossil?  
  a.   the presence of bacteria  
  b.   exposure to air and water  
  c.   the presence of scavengers  
  d.   rapid burial  
  Hint    
      
  11.During which era does the fossil record first contain fish?  
  a.   Mesozoic  
  b.   Precambrian  
  c.   Cenozoic  
  d.   Paleozoic  
  Hint    
      
  12.What does the principle of superposition state about layers of rock?  
  a.   Youngest layers of rock are sedimentary.  
  b.   Oldest layers of rock are found at the bottom.  
  c.   Oldest layers of rock are found at the top.  
  d.   Youngest layers of rock are found at the bottom.  
  Hint    
      
  13.How are fossils useful?  
  a.   They organize events on Earth into a time line.  
  b.   to determine what color an organism was  
  c.   to determine how many individuals of a type of organism once lived  
  d.   They reveal the soft tissue of an organism.  
  Hint    
      
  14.How can geologists determine the absolute age of a rock?  
  a.   by applying the principle of superposition  
  b.   by analyzing the fossil content of the rock  
  c.   by applying methods of radiometric dating to the rock  
  d.   by analyzing unconformities above and below the rock  
  Hint    
      
  15.Which absolute age marks the beginning of the absolute geologic time scale?  
  a.   4.6 billion years ago  
  b.   4.6 million years ago  
  c.   4.6 trillion years ago  
  d.   4.6 thousand years ago  
  Hint    

 
   
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