Here's a breakdown:
* Divergent Plate Boundaries: Where plates move apart, magma rises from the mantle to fill the gap, creating new crust. This is where mid-ocean ridges form, and also where some land-based volcanoes occur, like those in Iceland. However, most volcanoes on land are *not* found at divergent boundaries.
* Convergent Plate Boundaries: These are the areas where most volcanoes on land occur. Here, plates collide, with one plate usually subducting (sliding) beneath the other. As the subducted plate melts, it creates magma that rises to the surface, forming volcanoes. This is how the famous volcanoes of the Pacific Ring of Fire are formed.
* Hotspots: These are areas of volcanic activity that are not directly associated with plate boundaries. They are believed to be caused by plumes of hot mantle material rising to the surface. These plumes can create volcanoes on both land and ocean floors.
In summary: While divergent boundaries do create volcanoes, they are mostly underwater. Most volcanoes on land are formed at convergent boundaries where one plate subducts beneath another, or at hotspots where mantle plumes rise.
