1. Types of Plate Boundaries1

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 2

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 3

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

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? 5

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 6

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? 7

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

9. Examples: Great Rift Valley, Africa Mid-Atlantic Ridge, Atlantic Ocean9

10. Example: Great Rift Valley, Africa10

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

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

13. Example: San Andreas Fault Where is it?13