Volcanoes dot the earth. You can find them on land or under the oceans. Volcanic activity often occurs along the edges of continental and oceanic plates. They can form when an ocean plate pushes against a continental plate. Some volcanoes form when oceanic plates pull part along the ocean ridges. Some volcanoes form in hot spots where molten rock from the mantle rises to the surface.
Here is a science and reading printout to make nomenclature or 3 part cards.