1. Convergent Plate Boundaries

2. Convergent Plate Boundaries
Convergent plate boundaries are areas where two tectonic plates are moving toward each other
Will have the most explosive volcanic and earthquake activity
Oceanic-Oceanic
Oceanic-Continental
Continental-Continental

3. Lithospheric Plates There are 2 types of lithospheric plates:
Oceanic – Composed of Basalt, more dense
Continental – Composed of Granite, less dense
Subduction – Process where one plate is pushed underneath another
The denser plate is ALWAYS subducted under the less dense plate

4. Deep Sea Trenches Deep Sea Trenches – Deep depressions in the seafloor
Result from 2 plates converging
Mariana Trench – Deep Sea Trench located near East Asia.
The deepest area in the world (over six miles deep

6. Oceanic-Oceanic Convergent
2 oceanic plates come together
The denser plate goes underneath the other (subduction)
Some of the magma is forced back to the surface, pushes through the crust and forms a volcanic island arc and a deep sea trench
Mariana Trench
Aleutian Arc

9. Oceanic-Continental Convergent
An oceanic plate and a continental plate converge
Results in:
Volcanoes along coast of the continents
Deep Sea Trench
Example:
Mt. St. Helens
Peru-Chile Trench
Andes Mountains
Pacific Ring Of Fire

12. Pacific Ring of Fire
Pacific Ring Of Fire – Ring of volcanoes around the Pacific Ocean
Results from a convergent plate boundary
The Cascades in Western US is included
Contains the majority of active volcanoes on Earth

14. Continental-Continental Convergent
2 continental plates converge
The colliding edges of the continents are uplifted and form a mountain range (not volcanic)
Example:
Himalayas