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Stack #132895

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
Continental Drift   Alfred Wegener's hypothesis that continents have moved slowly to their current locations.  
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Pangea   The giant landmass where all the continents were connected.  
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Seafloor Spreading   Harry Hess's theory that was created to help explain why there are mid-ociean ridges.  
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Plate Tectonics   The theory that Earth's crust and upper mantle are broken into sections.  
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Plate   These sections move on the upper layer of the mantle.  
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Lithosphere   The plates and the upper mantle.  
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Asthenosphere   The plasticlike layer below the lithosphere.  
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Convection Current   The cycle of heating, rising, cooling, and sinking of material that is thought to be the force behind plate tectonics.  
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Earthquake   Sudden movements along plate boundaries or faults.  
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Primary Waves   The first seismec waves caused by earthquakes, about 2 times faster than secondary waves.  
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Secondary Waves   The seismec waves that come after the primary waves, much slower and weaker that primary waves.  
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Surface Waves   Seismec Waves that reach to the surface.  
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Epicenter   The area right above the focuse of an earthquake on the surface.  
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Seismograph   A special device that measures the strength and size of earthquakes with a pendulum, drum of paper, and a pen.  
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Volcano   An opening in the Earth that erupts gases, ash, and lava.  
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Vent   The opening where the material can escape.  
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Crater   The area around the vent that has been formed by cooling lava.  
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Hot Spot   Places between the mantle and core that are unusually hot. Hot rock is forced toward the crust at these areas where it partially melts.  
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Shield Volcano   A broad volcano with gently sloping sides formed by the build up of flat layeres. Has quiet eruptions.  
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Cindercone Volcano   A steeply sided volcano formed by loose material such as tephra. Has violent eruptions.  
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Composite Volcano   Volcano with quiet and violent eruptions. Has alternate layers of tephra and lava.  
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Tephra   Bits of rock or solidified lava that is dropped from the air.  
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Created by: Julian Jones
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