Oceanic to Oceanic, Oceanic to Continental, Continental to Continental
Oceanic to Oceanic
Oceanic to Oceanic happens when two (or more) plates collide, and one of them subducts. The older one is usually the one to go under because it is less dense. The subducting plate is heated as it travels downward into the mantle, when it reaches about 100 miles, it begins to melt. Magma chambers are a result of Oceanic to Oceanic Convergence.
Oceanic to Continental
When Oceanic and Continental plates collide usually the thinner and more dense one (oceanic) is overrun by the larger one. The oceanic then subducts about 160 kilometers before it begins to melt, thus creating magma.
Continental to Continental
When Continental to Continental occurs, there is a powerful collision. Subduction is prevented because both plates have a much lower density than the mantle. Effects of the conversion can be: intense folding and faulting, a broad folded mountain range, shallow earthquake activity, shortening and thickening of the plates within the collision zone.
In Oceanic Ridges, oceanic plates collide and diverge such as the Mid-Atlantic Ridges. Sometimes the widens, and could be filled with molten rock, thus creating volcanic islands such as Hawaii.
Rifts are formed when the Lithospheric plates are forced apart, breaking against parallel faults. As the plates separate, rocks and debris fall into Asthenosphere as magma seeps to the top, creating volcanoes.
Transform Boundaries are places where plates completely slide past each other. They are marked in some places by linear valleys along where rocks have been ground up and sliding.
That's All You Need To Know!
Thanks for viewing my presentation on Convergent Boundaries, Divergent Boundaries, and Transform Boundaries! :)