1. Types of Plate Boundaries

2. When 2 plates meet….. 1- They can crash together =
Convergent Boundary OR
2- They can move away from each other = Divergent Boundary OR
3- They can slide past each other = Sliding/Transform Boundary

3. Convergent Boundaries
There are two types of Convergent Boundaries:
A. Subduction: when one plate is more dense than another, the more dense plate goes underneath the less dense plate.
Subduction
The 2nd type is collision

4. Convergent Boundaries: Subduction
One plate goes under the other
Features that occur: Earthquakes, Volcanoes, Ocean Trench
Remember:
“The Ocean floor is going DOWN!!!!”

5. Example
Mt. St. Helens- Juan de Fuca plate goes under the North American Plate.
What are some indicators that a volcano might erupt soon?

6. Convergent Boundaries, Collision
B. Collision: when the 2 plates are the same material. When they hit, they both buckle up
(this makes mountains)
The two plates have the same density, they buckle up and move to a higher elevation
Features: Earthquakes, Folded Mountains

7. Example Mt. Everest, Himalayas
The plates are still colliding and gaining Elevation
What are some forces of nature that keep Everest from getting much higher?

8. Divergent Boundaries When two plates move apart. Features:
In continents:
Rift Valley, Volcanoes, Earthquakes
In oceans:
Mid-Ocean Ridge, Volcanoes, Earthquakes

9. Examples:
Great Rift Valley, Africa
Mid-Atlantic Ridge, Atlantic Ocean

10. Example: Great Rift Valley, Africa

11. Sliding/Transform Boundary
When two plates slide past each other.
Features: Earthquakes

12. Example:
California- Pacific Plate slides past the North American Plate at the San Andreas Fault.

13. Example: San Andreas Fault Where is it?