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  • In 1912 Alfred Wegener came up with the theory of continental drift which states that the continents can drift apart from each other
  • Pangea
  • Strike-Slip -- occurs when forces cause rocks to break Tension -- stress that occurs when forces try to stretch an object Fault-- the surface where rocks break and slide past each other Shearing -- when two plates slide across one another
  • Transform boundary - occurs when two plates slide past one another 
  • Subduction --region were the oceanic plate sinks into the atmosphere Oceanic Crust -- similar to basalt and averages 5 to 8 km thick Continental Crust -- similar to granite and averages 30 km Density -- the compactness of an object
  • Convergent Boundary - When two plates push into one another
  • Divergent Boundary - occurs when two plates move across from each other
  • convection current -- very hot material which rises, cools, sinks, then reheats mid-atlantic ridge -- underwater mountain chains seafloor spreading -- when new oceanic lithosphere is created
  • Earthquakes 
  • Epicenter -- the location where all three locations overlap triangulation -- when three circles are drawn seismograph -- records seismic waves p - waves -- primary waves, fastest travels through solids, liquids, and gases s- waves -- secondary, slower, travels through solids
  • Volcano
  • ring of fire -- a large area in the pacific where a lot of volcanoes occur explosive -- clouds of hot debris and gas shoot out of the volcano nonexplosive-- create lava flows shield-- built out of layers of lava cinder -- made of pyroclastic material composite -- most common type made by altering explosive and nonexplosive
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