* Oceanic Volcanoes: These are the most common type and form along mid-ocean ridges where tectonic plates diverge, allowing magma to rise from the mantle. They also form in volcanic arcs above subduction zones, where one plate slides beneath another.

* Continental Volcanoes: These form when magma rises through the continental crust, often along fault lines or in areas of tectonic activity.

It's important to remember:

* The type of crust a volcano sits on doesn't define its type. You can have shield volcanoes, stratovolcanoes, and other types on both continental and oceanic crust.

* The composition of the magma can be different. Oceanic volcanoes tend to erupt basaltic lava, which is more fluid. Continental volcanoes can erupt more viscous lava, leading to more explosive eruptions.

Let me know if you'd like to explore the different types of volcanoes in more detail!