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Plate Tectonics Plate Boundaries and Motion Plate Boundaries • Divergent Boundary – moving _____ apart • Convergent Boundary – moving ________ together • Transform Fault Boundary – moving ________________________ sideways past each other Divergent boundary of two continental plates. East African Rift rift valley Creates a __________. Example: _____________ Divergent boundary Divergent boundary Convergent boundary of two oceanic plates. island arc and a _____. trench Example: _____ Japan Creates an ________ Convergent boundary Convergent boundary Subduction Convergent boundary of an oceanic plate and a continental plate. Forms a _______ volcanic mountain range trench Examples: Cascades Andes Mts and a ______. _______ or _______ Convergent boundary of two continental plates. folded mountain range. Examples: Forms a ______ Himalayas ___________, Alps, ______________ Appalachians Transform-fault boundary where the North American and Pacific plates are moving ____ past each other. San Andreas Fault in California Example: ________________ Transform boundary Transform boundary Plate Boundary Summary Type of Boundary Process Involved Characteristic features Examples Divergent Sea-floor spreading Mid-ocean ridge Rift valleys, Earthquakes, Volcanic Activity Mid-Atlantic Ridge East Pacific Rise Convergent Ocean-ocean subduction Deep sea trenches Islands of Indonesia, Mariana Islands Ocean-continent subduction Volcano along coast of continent Continent-continent High continental collision Transform Plates sliding past each other West coast of S. America mountain chains Himalayas Earthquake activity San Andreas Fault, North Anatolian Fault, Fracture zones along mid-ocean ridge Plate Boundaries Review • Places where plates move apart are called divergent _____________ boundaries. rift valley • When continental plates diverge a ___________ is formed. • When two oceanic plates converge what is created? _________________ an island arc and a trench • The Appalachians formed mainly from continental folded plate collisions and therefore are a __________ mountain range. Convection currents • The force moving the plates is ____________ .
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