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Published byTabitha Ryan Modified over 9 years ago
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Divergent Boundaries Plates move away from each other Marine –Ocean basins open & seafloor created Continental –Rift zones & new ocean basins created
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Rift Zone East African Rift Valley Kilimanjaro and Mount Kenya Graben
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Divergent Boundaries
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Transform Boundaries Plates slide past one another Neither created nor destroyed
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Convergent Boundaries Plates move toward each other Marine –Trenches, destruction of sea floor & closing of ocean basins Continental –Creation of mountain ranges
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Convergent Boundaries Three types: 1.Ocean-Continent Convergence 2.Ocean-Ocean Convergence 3.Continent-Continent Convergence
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Ocean-Continent Convergence
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Mount St. Helens
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Ocean-Ocean Convergence
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Continent-Continent Convergence
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Himalayas
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Continental Margins Two types: 1.Passive –Closest to the divergent plate boundary 2.Active –Closest to the convergent plate boundary
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Mechanisms of Motion Convection cells?? Ridge push force Slab pull force
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Rates of Motion 1 – 20 cm per year Average rate of 5 cm/yr Slow spreading rates –Steep slopes Fast spreading rates –Gentle slopes
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Iceland
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Hawaiian Islands
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Hydrothermal Vents
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