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Plate Boundaries

Two plates come together at what boundary? Convergent
Two plates spread apart at what boundary? Divergent
Two plates slide past each other at what boundary? Transform
New oceanic crust (sea floor) is created at this boundary. Divergent Oceanic
Oceanic crust (sea floor) is destroyed at this boundary. Convergent (except for Continental-Continental because crust is too buoyant)
The process where oceanic crust slides under another plate and is melted is called ___________. subduction
What events/features occur near subduction zones? Trenches, Volcanoes, and Earthquakes
A divergent boundary on land creates what feature? Rift Valleys (ex. Great Rift Valley in Africa)
A divergent boundary in the ocean creates what feature? Mid Ocean Ridges (ex. Mid-Atlantic Ridge)
When two continental plates converge (collide) what type of crustal feature is formed? folded mountains (ex. Himalaya Mountain Range)
The process that occurs at a divergent oceanic boundary that creates new crust (sea floor) is called? seafloor spreading
What is happening in the mantle that helps move the lithospheric plates? convection currents
If an earthquake occurs at the bottom of the ocean floor what could form? tsunami
Convergent boundaries involving oceanic crust always undergo subduction which creates what two crustal features? trenches and volcanoes
What is the only event associated with transform boundaries? earthquakes (ex. San Andreas Fault)
What is the only event associated with ALL plate boundaries? earthquakes
True or False: Trenches are formed at Divergent oceanic boundaires False (Mid ocean ridges are formed at divergent oceanic boundaries from the pressure of the magma uplifting the crust.)
True or False: Divergent boundaries are where subduction zones occur. False (Subduction zones occur at convergent boundaries involving oceanic crust)
The two types of the Earth's crust are __________ and ___________. Oceanic and Continental
The difference between oceanic crust and continental crust is... Oceanic crust is mostly made of Basalt (more dense) and Continental crust is mostly made of Granite (less dense)
Harry Hess helped discover what theory? Seafloor Spreading
Alfred Wegener discovered what theory? Continental Drift
What two theories largely contributed to Plate Tectonic Theory? Seafloor Spreading (Hess) and Continental Drift (Wegener)
Tsunamis are formed from what two types of convergent boundaries? oceanic-oceanic and oceanic-continental
Why doesn't subduction occur at continental-continental convergent boundaries? Because continental crust is too buoyant to be subducted into the mantle. (The plated fold up to create folded mountains instead.)
Created by: fordi85
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