1. Transform Plate Boundaries

2. Transform Boundaries
Transform Boundary - Place where two plates slide horizontally past each other
Crust is not created or destroyed
Earthquakes occur but NOT volcanoes

3. San Andreas Fault
San Andreas Fault – Transform boundary that extends through California
Runs right through San Francisco
Reason why California has a lot of Earthquakes

6. Reasons for plate movements
Plate movements are generally caused by 3 mechanisms:
Convection
Ridge Push
Slab Pull

7. Convection Current
A convection current is the reason for plate movements
Hotter parts of the mantle rise while cooler parts sink
Puts a force on the lithosphere which drives plate movement

8. Ridge Push
Along mid-ocean ridges new oceanic crust is created as magma rises from the mantle
As the magma rises this heats up the rocks around the ridge
When the rocks cool they then become denser  This exerts a force on the lithospheric plate and pushes it away from the plate boundary

9. Slab Pull
At subduction zones the denser, oceanic plate is being pulled down
Because the plate has a high density it helps “pull” the rest of the plate down as well