Major geological events
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Major Geological Events PowerPoint PPT Presentation


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Major Geological Events. Caused by Plate Tectonics. Types of Boundaries. Divergent   Plates move apart Convergent  Plates come together Transform Plates slide horizontally past each other. Divergent Structures. New crust is formed as plates pull apart

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Major Geological Events

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Major geological events

Major Geological Events

Caused by

Plate Tectonics


Types of boundaries

Types of Boundaries

  • Divergent  

    • Plates move apart

  • Convergent 

    • Plates come together

  • Transform

    • Plates slide horizontally

      past each other


Divergent structures

Divergent Structures

  • New crust is formed as plates pull apart

  • Land features include:

    • Mid-Ocean Ridges

      Ex. - Mid-Atlantic Ridge

    • Rift Valleys

      Ex. - African Rift Valley

    • Earthquakes


Mid ocean ridge location of sea floor spreading

Mid–Ocean Ridge (Location of Sea Floor Spreading)


Sea floor spreading mid ocean ridge

Sea Floor Spreading (Mid-Ocean Ridge)

Younger

Older

Older

Divergent Structure


Rift valley

Rift Valley

Divergent Structure


Convergent boundaries

Convergent Boundaries

  • Crust is destroyed and recycled back into the mantle

  • Three types of convergent collisions

  • Features include:

    • Trenches – Mariana Trench

    • Volcanic Arc (Volcanic Mountains) – Andes mountains

    • Mountain Ranges – Himalayan Mountains

    • Earthquakes


Subduction

Subduction

  • Result of convergent boundary

  • A more dense plate slides under a less dense plate and sinks into the mantle.

  • Features include:

    • Oceanic-Oceanic = Trenches

    • Oceanic-Continental = Mountain Ranges


Subduction examples

Subduction Examples


Convergent boundary

Convergent Boundary

  • Oceanic-Oceanic

    • Land Features – Trench and Island Arc

Oceanic-Oceanic convergence


Convergent boundary1

Convergent Boundary

  • Oceanic-Continental

    • Land Features – Trench and Volcanic Arc (Volcanic Mountains)

Oceanic-Continental convergence


Convergent boundary2

Convergent Boundary

  • Continental-Continental

    • Land Features – Folded Mountains

Continental-Continental convergence


Mountain ranges

Mountain Ranges


Transform fault structures

Transform Fault Structures

  • Crust is neither destroyed nor created

  • Can occur between two oceanic plates or oceanic-continental plates

  • Features include:

    • Earthquakes

    • Fault line – San Andreas Fault


Transform boundary

Transform Boundary

  • Oceanic-Oceanic

    • Land Feature – Fault Line


Transform boundary1

Transform Boundary

San Andreas Fault Line


Transform boundary2

Transform Boundary

  • Continental-Continental

    • Land Features – Fault Line


Earthquakes all boundaries

Earthquakes – All Boundaries


Volcanoes

Volcanoes


Mountain ranges1

Mountain Ranges


Putting it all together

Putting It All Together


Plate boundaries

Plate Boundaries


Plate movement

Plate Movement


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