1. Three Types of Plate Boundaries
Divergent
Convergent
Transform or strike/slip

2. Plates interact where they meet.

3. Divergent boundaries— Plates move apart
Example a spreading center--Mid-Atlantic Ridge
The Mid-Atlantic Ridge goes through Iceland.

4. Expeditions study unusual life

5. Or the Great Rift Valley in Africa

6. Convergent boundaries --plates move together

7. Three types of Convergent Plate Boundaries
oceanic –oceanic
oceanic-continental
continental-continental

8. Oceanic-oceanic
results in subduction of one plate results in island arc volcanoes

9. Ocean-continental results in subduction of the oceanic plate

10. Ocean-continental
Volcanoes form when the oceanic plate reaches the lithosphere and begins to melt
The less dense molten material rises and forms a volcano
Because it is a mixture of basaltic oceanic crust and granitic continental crust, the lava is Andesitic
Like the Andes Mountains

11. continental-continental

12. Continental-continental
results in enormous mountains like the Himalayas.

13. Transform-fault boundaries--plates slide horizontally
Example--Pacific plate and the North American plate slide past each other at the San Andreas fault.

15. most of the Pacific ocean?
What plate makes up
most of the Pacific ocean?