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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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Presentation on theme: "Divergent Boundaries Plates move away from each other Marine –Ocean basins open & seafloor created Continental –Rift zones & new ocean basins created."— Presentation transcript:

1 Divergent Boundaries Plates move away from each other Marine –Ocean basins open & seafloor created Continental –Rift zones & new ocean basins created

2 Rift Zone East African Rift Valley Kilimanjaro and Mount Kenya Graben

3 Divergent Boundaries

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6 Transform Boundaries Plates slide past one another Neither created nor destroyed

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8 Convergent Boundaries Plates move toward each other Marine –Trenches, destruction of sea floor & closing of ocean basins Continental –Creation of mountain ranges

9 Convergent Boundaries Three types: 1.Ocean-Continent Convergence 2.Ocean-Ocean Convergence 3.Continent-Continent Convergence

10 Ocean-Continent Convergence

11 Mount St. Helens

12 Ocean-Ocean Convergence

13 Continent-Continent Convergence

14 Himalayas

15 Continental Margins Two types: 1.Passive –Closest to the divergent plate boundary 2.Active –Closest to the convergent plate boundary

16 Mechanisms of Motion Convection cells?? Ridge push force Slab pull force

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18 Rates of Motion 1 – 20 cm per year Average rate of 5 cm/yr Slow spreading rates –Steep slopes Fast spreading rates –Gentle slopes

19 Iceland

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21 Hawaiian Islands

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23 Hydrothermal Vents


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