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Barnett - Plate tectonics

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divergent   boundary where 2 plates are moving away from each other; associated with mid-ocean ridges  
convergent   boundary where 2 plates are colliding; associated with deep-sea trenches, volcanoes, and mountains  
transform   boundary where 2 plates are sliding past one another; associated with faults and earthquakes  
Wegener   man who came up with the theory of continental drift  
Hess   man given credit for the theory of plate tectonics  
basalt   rock that covers most of the ocean floor  
Pangaea   name of the supercontinent 200 million years ago  
continental drift   theory stating the continents used to be joined in a single land mass and have since drifted to their current locations  
subduction   one tectonic plate is being forced under another tectonic plate  
mid-ocean ridge   chain of underwater mountains  
deep-sea trench   long, narrow depression on the ocean floor; occurs at convergent boundaries  
plate tectonics   theory that the Earth's crust is broken into plates which move in different directions at different speeds  
lithosphere   strong, rigid layer of Earth including the uppermost mantle and overlying crust  
asthenosphere   a weak plastic-like layer of the mantle situated below the lithosphere; convection currents happen here  
seafllor spreading   theory stating that new crust is made at mid-ocean ridges and old crust is destroyed at deep-sea trenches  
rift valley   long narrow depression that forms when continental crust separates at a divergent boundary  
fault   fracture in the Earth's crust; transform boundary  


   


 

 

 

 

 

 
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