Plate Tectonics

Plate Tectonics

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  • Alfred Wegener's theory of continental drift states that continents can drift apart from another and have done so in the past. 
  • Divergent
  • Alex Wegener a scientist whomst ideas were first laughed at but later helped us understand a lot more.
  • Transform boundaries only happen when two plates slide past each other. This is called shearing.
  • Transform
  • Eathquakes
  • Tension Stress that occurs when forces act to stretch an object. Fault  A break in the Earth's crust which blocks of crust blocks of crust slide relative to one another. Strike-slip occurs where two plates slide horizontally to one another.
  • Occurs when two plates push against eachother.
  • Convergent
  • Volcanoes
  • Subduction The downward movement of a plate into the mantle beneath another plate. Oceanic Crust Similar to basalt.  Continental Crust Similar to granite. Density  Consistency measured by mass per unit volume.
  • Occurs when two plates pull apart. After these plates have moved apart magma will rise creating seafloor(seafloor spreading).
  • Convection Current When heat rises and falls when cooled. Mid-Atlantic Ridge Longest mountain range in the world made by divergent plates.
  • Occurs when tectonic plates slide.
  • Occurs when molten rock forces itself to the the surface.
  • Ring of Fire A trail of active volcanoes on the pacific plate. Explosive A big eruption shooting out ash,gas,and lava. Non-Explosive A smaller eruption that just flows out of the volcano. Shield Volcanoes built out of nonexplosive eruptions.  
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