1. Types of Convergent Boundaries
Plate Tectonics – Part 2
Types of Convergent Boundaries
PLATE COLLISIONS!!!!

2. Oceanic – Continental Convergence
1. Collision!!!
2. Continental Crust is less dense so Oceanic crust sinks (subducts) into the asthenosphere.

3. Oceanic – Continental Convergence
3. Subducting Ocean Plate creates a V-shaped Trench.
4. Oceanic Plate reaches the asthenosphere and melts.

4. Oceanic – Continental Convergence
5. The melted magma begins to rise through the mantle and crust.
6. It will rise to make a volcanic eruption.
7. Lava cools forming a continental volcanic arc.

5. Oceanic – Continental Examples
Cascades Mountain Range (Mt. St. Helens)
Andes Volcanic Mountains (South America)

6. Oceanic – Oceanic Boundary
1. Collision!!!
2. The more dense ocean plate (older) subducts into the asthenosphere.

7. Oceanic – Oceanic Boundary
3. Oceanic crust melts into magma.
4. Magma becomes buoyant and rises.
5. This eventually forms volcanic islands in the water.

8. Example of Oceanic-Oceanic Boundaries
ALUETIAN ISLANDS

9. Example of Oceanic-Oceanic Boundaries
Northern Mariana Islands

10. Continental – Continental Boundary
1. Collision!!!
2. Neither plate subducts because they are both low in density.

11. Continental – Continental Boundary
3. Crust is compressed and deformed, forced upward forming a mountain range.

12. Example: Continental- Continental Convergence
Mt. Everest! (Himalayan Mts.)