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Types of Plate Tectonics (Convergent Plate Boundaries (Three Types of…
Types of Plate Tectonics
Refer to notebook for diagrams
Divergent Plate Boundaries
Types of Landforms: linear rift valley, axial magma chamber, volcanoes, ocean ridges
Two types: oceanic-oceanic and continental-continental
Central magma chamber
Linear rift valley with basaltic volcanism
Rifting cause land to drop below sea-level
Valley fills with seawater
Convergent Plate Boundaries
Subduction is density driven
Denser (older and colder) plate will subduct
Water from subducted plate causes melting in the mantle
Results in volcanism above the downgoing plate
Continental crust is less dense than the mantle, so it can’t subduct
High mountain belts
Three Types of Boundaries
Oceanic-Continental Subduction: Deep trench, active continental volcanic arc, explosive and dangerous volcanic eruptions, largest earthquakes on earth
Oceanic-Oceanic: deepest ocean trenches, active islands volcanic arcs, frequent volcanic eruptions and large earthquakes
Continental-Continental: highest mountains on earth, no volcanism, large earthquakes, oceanic sedimentary rocks found in high mountains
Transform Plate Boundaries
Frequent shallow earthquakes
Not associated with volcanism
Straight linear features
Oceanic-Oceanic
Long and linear faults that separate two spreading ridges
Faults are always perpendicular to ridge axis
Inactive fracture zones continue outward from fault
Frequent shallow earthquakes