1. Boundaries

2. #22 At the edges or boundaries of the plates, the earth's crust is in motion.

3. Boundaries Divergent Convergent Transform Plates move apart
Plates push together
Transform
Plates scrape past one another

4. #24 At divergent plate boundaries such as the mid-Atlantic ridge, new ocean floor is created.

5. Convergent Boundaries
3 types
Continental-Continental Collision
Oceanic-Oceanic Subduction
Ocean-Continental Subduction

6. Continental-Continental Collision
Both crusts push together
Crusts are same density so neither plate can sink
#26 When continental crust meets continental crust at a convergent boundary, a collision occurs, resulting in folds, faults, and high mountains.

7. Oceanic-Oceanic Subduction
One plate with oceanic crust sinks (subducts)
A result of being cooler, older and more dense
Crust melts when it reaches Mantle
Forms:
Deep-ocean ridges
Island Arcs
Ex. Japan and Philippines

8. Ocean - Ocean
A location where two plates of oceanic crust are coming together.

9. Subduction Why does one plate usually sink below another plate?
The more dense plate sinks below the less dense plate.
Continental crust = 2.8 g/cm3
Oceanic crust = 3.0 g/cm3

10. Oceanic-Continental Subduction
Oceanic crust sinks under continental crust
Ocean crust = cooler, older and more dense
Forms:
Deep ocean trenches
Coastal mountains

11. Continent - Ocean
A location where continental crust is colliding with oceanic crust

12. #25 At convergent plate boundaries known as subduction zones, a trench and deep earthquakes mark the zone where a slab of oceanic lithosphere descends into the mantle, and volcanoes and mountain ranges form on adjacent land.

13. Transform Boundaries Crust isn’t formed or destroyed
Crust can move past one another in opposite directions

14. #27 Transform boundaries are where plates slide past each other
#27 Transform boundaries are where plates slide past each other. They connect other plate boundaries and are characterized by earthquakes.

15. Transform boundary
A location where two plates are sliding past one another.

16. Review What are the 3 types of boundaries and what do they do?
Divergent-pull apart
Convergent-push together
Transform-scrape past one another
What are the 3 types of convergent boundaries?
Continental-Continental
Oceanic-Oceanic
Oceanic-Continental