1. What happens when two tectonic plates come together?
AKS 17b2

2. Deformation
The process by which a rock changes shape. The forces are called stress.

3. Three ways it can change
1 – compression is the stress when an object is squeezed 2- tension is the stress that occurs when an object is stretched 3 - shearing is the stress when objects push past each other.

4. Boundary A place where tectonic plates touch. Stress occurs here
Three types of boundaries–
Divergent – pulls apart
Convergent – pushes together
Transform – slides beside

5. Using your hands demo
Divergent – move hands apart Convergent – move hands together Transform – move hands back and forth

6. Practice plate boundaries!

7. Practice

8. Practice

9. 1 = convergent, 2 = divergent, 3 = transform
Which happens when two boundaries slide past each other.
What happens when two boundaries come together.
What happens when two boundaries push apart.

10. Divergent boundaries Where tectonic plates are pulling apart
Always oceanic plate and oceanic plate
Magna rises toward surface and pushes plates apart
Makes new crust
Causes seafloor spreading
produces the mid-oceanic ridge

11. Watch this!

12. IN YOUR OWN WORDS, DESCRIBE WHAT IS HAPPENING HERE.

13. Transform boundary
where plates push past each other. Can be continental or oceanic plates. Ex: San Andreas fault in California

14. In your own words, what is happening here?

15. Watch this!

16. 1 = divergent, 2 = transform
Magma comes close to the surface
Happens only with oceanic plates
Happens when tectonic plates push apart
Happen with any kind of tectonic plate
Happens when tectonic plates slide past each other
Results in sea-floor spreading and mid-ocean ridges

17. Convergent boundary
Where boundaries push together. Can be continental and continental Can be oceanic and continental Can be oceanic and oceanic

18. Continental and continental convergent boundary
Results in plates being pushed up and creates mountains

19. Watch this!

20. Oceanic vs. continental
Results in the most dense (oceanic) layer being subducted. This creates a subduction zone, an area where one layer is pushed under the other and is remelted and recycled. May result in volcanoes

21. Watch this!

22. Oceanic and oceanic convergent plates
- results in a subduction zone - May result in volcanoes and volcanic islands.

23. Watch this!

24. 1= divergent, 2= convergent, 3 = transform
Results in seafloor spreading
Results in mountains
Happens when tectonic plates slide past each other
Happens when tectonic plates push together
Happens when tectonic plates pull apart
Creates the mid-oceanic ridge

25. Identify the boundary A B C