The plates are moving at a very slow rate of between one to ten centimeters per year. In some areas plates are moving together through a process called convergence, while in other areas they are moving apart. There are three main types of convergent boundaries: continental-continental, continental-oceanic, and oceanic-oceanic. At convergent boundaries, one plate dives beneath the other through subduction, which can cause volcanic activity at the surface.

1. The plates are moving at a very
slow rate of about one to ten
centimeters per year.
In areas plates are moving
together and others are moving
apart.

3. http://www.youtube.com/watch?v=0mW
Qs1_L3fA

4. Click here for a hyperlink to an animation of convection

7. A convergent boundary is where two
plates come together, or converge. The
result of the plates hitting together is
called a collision.

8. a. Continental crust to continental
b. Continental crust to oceanic
c. Oceanic crust to oceanic

9. a. Continental crust to continental crust
Before collision
Example: India-Asia
(Himalayas)
After collision
from: http://www.geo.lsa.umich.edu/~crlb/COURSES/2

11. Eurasian
plate
Indian plate
Indian plate (continental crust) running into
Eurasian plate (continental crust)

14. Folded mountains – notice the rock layers

15. SUBDUCTION

16. The process by
which the ocean
floor sinks
beneath a deepocean trench
and back into
the mantle is
called

17. Oceanic crust is
MORE DENSE
than Continental!

18. • Because one plate gets pushed
under another, it is called
subduction.
• This is where volcanoes and
trenches form!
all from: http://www.geo.lsa.umich.edu/~crlb/COURSES/270

19. Volcanoes
form where
a
convergent
boundary
occurs
between
oceanic
crust and
continental
crust.

20. South American plate (continental crust) running into
Nazca plate (oceanic crust)

23. SUBDUCTION

25. Volcanoes also form where a
convergent boundary occurs
between oceanic crust and oceanic
crust.

26. Aleutian islands of Alaska are volcanoes
formed by oceanic crust converging
with oceanic crust

27. Following volcanic islands in the
Pacific Ocean can show us where
oceanic crust is being subducted
by oceanic crust.

28. Here is an great link for seeing
where each type of boundary is
located.