1. 3 Movements at plate boundaries
Plate Tectonics
3 Movements at plate boundaries

2. Divergent boundaries Plates are moving apart
As plates move apart, new crust forms Cause of movement is convection cells in mantle
Mid ocean ridges are divergent boundaries where seafloor spreading occurs – an example is the Mid-Atlantic Ridge.
Rift valleys are divergent boundaries on land – The Great Rift Valley in east Africa is an example of a continent breaking apart. The Red Sea is a part of the rift.

3. Convergent plate boundaries
Two plates are colliding or moving together
Old crust is being deformed or destroyed(melted) due to collision
At convergent zone one of two things can happen
Oceanic plate crust can be forced down underneath less dense continental or oceanic crust, forming a deep ocean trench at the subduction zone. Ex: Aleutian trench south of Alaska
Continental plates colliding cause rocks to fold and break, creating mountain ranges Ex: Himalaya mountains where India collides with Asia

4. Transform Boundary Two plates sliding past each other.
Crust is neither created nor destroyed (side swipe)
Example: San Andreas fault in S. Calif between the N. American and Pacific plates