1. Guide to plate movement
Plates on the Move
Guide to plate movement

2. There are three types of plate movement

3. Picture from www.geology.com
1. Divergent
Also known as seafloor spreading
Plates are separating from each other as a new land mass forms
This is seen at mid-ocean ridges and rifts
Plate separation is a slow process. For example, divergence along the Mid Atlantic ridge causes the Atlantic Ocean to widen at only about 2 centimeters per year.
Picture from
Author Hobart M. King

4. The Great Rift Valley- Africa

5. Rift valley

6. 2. Convergent
Two continental plates collide. & crumple the edges of the plates & form mountains.
We can see the end result of the collision between the Indian & Eurasian plates which are the Himalayan Mountains.
Picture from USGS
Picture from Author Hobart M. King

7. Convergent Boundaries
Two plates come together.
The denser plate will sink.
Oceanic plates are ALWAYS denser than continental plates.
If two oceanic plates come together, the denser one will sink.
If an oceanic plate and a continental plate collide, the oceanic plate will sink and the area will be a subduction zone.

8. 6. When two continental plates collide, mountains form
6. When two continental plates collide, mountains form. Neither plate will sink.
7. Faults are a break in earth’s crust.

9. Convergent- Himalayan Mtns.

10. Subduction
When an oceanic plate goes underneath or is subducted under a continental plate it is called subduction.
This forms a trench, or deep valley, where the plates meet.
An example of a subduction zone is the Marianas Trench where the Pacific Plate is subducting under the Eurasian Plate.
Subduction is another type of a convergent plate movement.
Picture from Author Hobart M. King

11. Subduction and the mantle

12. 3. Transform Two plates slide past each other
Example: San Andreas Fault in California
Picture from
Author Hobart M. King

13. Transform- San Andreas Fault

14. Fault Lines, stress and earthquakes

15. Fault Lines and Earthquakes

17. Transform
Convergent
Divergent