The reason naturally forming glass (such as obsidian) is NOT considered a mineral it is that __________.  

  Seafloor spreading occurs __________.  

  Consult the figure below. Here, distinct internal laminations are inclined at an angle to the boundary of the main sedimentary layers. These are termed __________.    

  A body of rock starts at location A in the graph below. The rock, over time, moves to location B and begins to melt. This is an example of melting due to __________.    

  Wegener’s proposal that the continents had once fit together as a single supercontinent was rejected by geologists at the time because __________.  

  The difference between magma and lava is __________.  

  Intrusive rocks that form deep within the Earth __________ than intrusive rocks that cool near the surface.  

  Which of the following are most likely to preserve conditions of ancient environments on the Earth?  

  The image below of Death Valley, California, shows a road that curves around a(n) __________.  

Which of the following is a secondary hazard that can be caused by earthquakes? Select all that apply