1. Boundaries Types

2. Transform Two plates slide past each other
As they slide, earthquakes often occur
Examples: California’s San Andreas Fault

4. Divergent
When two plates spread away from each other forming new crust
Causes earthquakes and volcanoes
Usually undersea
Example: Iceland

6. Convergent- Ocean-Ocean
When two ocean plates meet
As the denser plate slides underneath the other, the plate melts to magma and rises
Magma reaches ocean floor and slowly rises to form volcanic island arcs
Earthquakes can occur
Example: Ring of Fire

8. Convergent – Ocean-Continent
When an ocean plates slides under a continent plate
Forms volcanoes and earthquakes like an ocean-ocean boundary
Examples: Western South America (Andes), Mt. St. Helens, Washington

10. Convergent Continent-Continent
Occurs when two continent plates meet
Since similar densities, they do not slide easily underneath in to mantle
The force of the collision pushes up mountains
Earthquakes are common
Example: The Himalayas