Colliding Boundaries
Description: These boundaries are formed when two plates CRASH INTO each other. They are also referred to as "convergent boundaries." Converge means to come together.
Sometimes, one plate gets pushed under the other plate. This is called SUBDUCTION. An example of subduction is when ocean crust collides with continental crust, the ocean crust sinks below the continental crust. The ocean crust begins to melt, forming hot magma that is released through the formation of VOLCANOS! New continental crust is formed when volcanos erupt.
When ocean crust collides with another plate of ocean crust, the more dense plate will subduct under the other, meaning the one that is "heavier" will sink. Subduction occurs.
When continental crust collides with continental crust, there is no subduction! The crust gets squeezed up into MOUNTAINS!