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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

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
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
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

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