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Plate Boundaries

TermDefinition
Plate Tectonics Theory that the lithosphere is divided into tectonic plates that slowly move on top of the asthenosphere.
Convection Currents A cyclical motion occurs because of density differences in the mantle. Hotter rock rises, cooler rock sinks. This motion moves the plates.
Convergent boundary Occurs when two tectonic plates move toward each other and collide.
Divergent boundary The boundary between two tectonic plates moving away from each other.
Transform boundaries Occurs when two tectonic plates slide past each other.
Fault Any fracture or system of fractures in the crust.
Subduction The process in which a denser plate is pushed downward beneath a less dense plate when plates converge; occurs at continental / oceanic boundaries and oceanic / oceanic boundaries.
Trench A deep and narrow depression in the seafloor where the subducted plate moves into the asthenosphere.
Rift valley A low region formed between continental plates on a divergent boundary where the plates separate.
Mid-ocean ridge Underwater mountain range created when magma rises between two tectonic plates at a divergent boundary.
Volcano Forms at some convergent boundaries, both continental/oceanic and oceanic/oceanic
Earthquake A sudden movement of Earth's crust caused by the release of stress accumulated along geologic faults or by volcanic activity.
volcanic island arc A series of volcanoes formed at a subduction zone where oceanic crust and oceanic crust meet at a convergent boundary.
Created by: user-1748583
 

 



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