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8 Cards in this Set
- Front
- Back
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PLATE BOUNDARIES
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* place where 2 lithospheric plates meet
* area where geologic activity occurs (qaukes, volcanoes, mountain building) |
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DIVERGENT BOUNDARIES
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* AKA - Spreading Centers
* where 2 plates move away from each other * new crust is formed (productive site) * most found on ocean floor @ MOR * ex: Pangaea, Rift Valley in Africa |
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CONVERGENT BOUNDARIES
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* where 2 plates collide
* 3 types based on types of plates involved (see those) |
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OCEANIC - CONTINENTAL CONVERGENT BOUNDARY
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* AKA: O-C Boundary
* oceanic plate collides with continental plate * oceanic plate subducts under continental plate - it's more dense * causes major quakes & explosive volcanoes * produces ocean trenches * ex: Andes Mountains (S. America) |
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OCEANIC - OCEANIC CONVERGENT PLATE BOUNDARY
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* AKA: O-O Boundary
* oceanic plate collides with oceanic plate * older plate subducts under younger plate - it's more dense * causes quakes and volcanoes * ex: Islands of Japan |
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CONTINENTAL - CONTINENTAL CONVERGENT PLATE BOUNDARY
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* AKA: C-C Boundary
* continental plate collides with continental plate * neither is subducted - similar densities * rocks crumple - fold - create mountains * ex: Himalayas |
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TRANSFORM BOUNDARIES
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* 2 plates slide past each other
* plates get "hung up" - build stress & pressure --> * rocks break --> plates lurch = earthquake ex: San Andreas Fault - California |
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OCEAN RIDGE SYSTEM
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* series of mountain ranges under the oceans
* Mid-Atlantic Ridge is most famous |
