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Plate Test

Stack #132895

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