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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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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