How do composite volcanoes form?

composite volcanoes, or stratovolcanoes, are formed though the collision of Oceanic and continental plate boundaries.

Composite volcanoes, or Stratovolcanoes, are formed through the collision of Oceanic and Continental plate boundaries. This process is also known as Ocean-Continental Convergence. As Oceanic crust is thinner and denser than Continental crust, it will subduct under the Continental crust during collision.