welcome to moomoomath and science and plate boundaries some of the most dramatic changes in the Earth's crust like mountain ranges new islands or earthquakes occur along plate boundaries there are three types of plate boundaries divergent boundaries convergent boundaries and transform boundaries convergent boundaries occur when two plates collide there are three major types first is continental to continental this occurs when two plates of continental crust collide they buckle and thicken and this causes mountains to form next you have continental to ocean collisions when a plate of ocean crust collides with a plate of continental crust the ocean crust is more thick and subducts or goes underneath the continental crust the magma from the melted oceanic crust rises to the surface and this results in volcanoes along the boundary ocean to ocean collisions occur when two plates of oceanic crust collide the older more dense plate subducts under the younger plate and as a result the crust melts and creates an island arc next you have divergent boundaries this is when two plates move away from each other the separation allows the asthenosphere to rise towards the surface and partially melt this melting creates magma which erupts as lava and then the lava cools and hardens to create new rock an ocean floor or new continental crust that's the crust an upper part of the asthenosphere cool and become right rigid they form new lithosphere like mid-ocean ridges most of these divergent boundaries are located on the ocean floor however rift valleys may also form where the continents are separated by plate movement and finally transform boundaries occur where two plates move past each other horizontally when the plates move next to each other they do not go along smoothly instead they scrape of each other in a series of sudden slippage 'as of crustal rock and these can be felt as earthquakes unlike the other types of boundaries transform boundaries generally do not produce magma the San Andreas Fault in California is a major transform boundary so there we go three types of plate boundaries convergent divergent and transform thanks for watching and moomoomath uploads a new math and science video every day please subscribe and share