Final answer:
Activity resulting in volcanoes, island arcs, and mountains is associated with Plate 3 in geography.
Step-by-step explanation:
Activity resulting in volcanoes, island arcs, and mountains is associated with Plate 3. Volcanoes are formed when magma rises to the surface and erupts, creating a vent or opening. Island arcs are formed when two oceanic tectonic plates collide, causing one plate to be forced beneath the other, resulting in a curved chain of volcanic islands. Mountains are often formed as a result of tectonic plate collisions or when plates push against each other, causing the Earth's crust to fold or buckle.
Learn more about Plate Tectonics