GEOLOGY

Detailed explanation-1: -Volcanism occurs at convergent boundaries (subduction zones) and at divergent boundaries (mid-ocean ridges, continental rifts), but not commonly at transform boundaries.

Detailed explanation-2: -Volcanoes form here in two settings where either oceanic plate descends below another oceanic plate or an oceanic plate descends below a continental plate. This process is called subduction and creates distinctive types of volcanoes depending on the setting: ocean-ocean subduction produces an island-arc volcano.

Detailed explanation-3: -The volcanoes produced by subduction zone volcanism are typically stratovolcanoes. Incipient island arcs tend to be more basaltic in composition, whereas mature continental volcanic arcs tend to be more andesitic in composition.

Detailed explanation-4: -Based on Figure 2, volcanoes always form near a plate boundary EXCEPT at. subduction zones. major earthquakes. hot spots.