1. Divergent boundaries 2 plates move apart
Most occur at the mid ocean ridge where sea-floor spreading occurs
Forms oceanic crust = Basalt
When form on land = rift valley

2. Divergent boundaries 2 plates move apart
Most occur at the mid ocean ridge where sea-floor spreading occurs
Forms oceanic crust = Basalt
Sea-Floor Spreading
Creates oceanic crust and causes the plates to move.

3. Divergent boundaries 2 plates move apart
Most occur at the mid ocean ridge where sea-floor spreading occurs
Forms oceanic crust = Basalt
When form on land = rift valley

4. Rift Valley

5. Great Rift Valley in Africa

6. Great Rift Valley in Africa

7. Convergent boundaries
2 plates come together
Oceanic crust = more dense
Continental crust = less dense
Collisions
Oceanic to continental = subducting oceanic plate

8. Convergent boundaries
Continental to continental = mountain building

9. Convergent boundaries
Continental to continental = mountain building
Continental Crust = Granite