1. Tectonic Plate Boundaries

2. Types of Boundaries
Convergent
Divergent
Transform

3. Convergent Two tectonic plates collide Three types: Oceanic-Oceanic
Continental-Continental
Oceanic-Continental

4. Oceanic-Oceanic Two oceanic plates collide
The denser one subducts beneath the other
Subduction zone
Volcanoes can form
The denser plate melts and becomes magma
Magma can be forced up through vents

5. Oceanic-Continental An oceanic and a continental plate collide
The denser oceanic plate subducts beneath the less dense continental plate
Subduction zone
Volcanoes can form
The denser plate melts and becomes magma
Magma can be forced up through vents

6. Continental-Continental
Two continental plates collide
The plate are of equal densities
They buckle and thicken, pushing the crust upward
Mountains form

7. Divergent
Two tectonic plates move away from one another

8. Divergent Seafloor spreading occurs at divergent boundaries
Volcanoes can form at divergent boundaries
Plates move apart and expose a vent
Magma slowly rises to the surface
Magma cools and hardens into new oceanic lithosphere

9. Transform
Two tectonic plates slide past each other horizontally

10. Transform Earthquakes typically occur at transform boundaries
Stress builds up and is eventually released, causing a violent shift
The movement from this shift is an earthquake

11. Volcanoes at Hot Spots
A hot spot is a place beneath the earth where very hot magma exists.
When a plate moves over a hot spot in the mantle, a vent can be exposed
Fountains of magma punch through the crust

12. Summary Three types of boundaries Convergent Divergent Transform
Oceanic-oceanic
Oceanic-Continental
Continental-Continental
Divergent
Transform

13. Summary Volcanoes form at: Convergent Boundaries Divergent Boundaries
Oceanic-oceanic
Oceanic-continental
Divergent Boundaries
Hot Spots

14. Summary Seafloor spreading occurs at Earthquakes typically occur at
Divergent boundaries
Earthquakes typically occur at
Transform boundaries