complex volcano

Complex volcanoes are mixed landforms that arise from changes in eruptive habits or vent locations. They can form when a stratovolcano develops an explosion crater that later fills with a lava dome, or when multiple cones and craters emerge on a caldera's rim. Sometimes, overlapping individual cones create a stratovolcano with multiple summits, as seen in Oregon's Three Sisters volcanic complex.1

Volcanism, the process of molten rock, hot water, and steam discharging onto the Earth's surface, is a significant geological phenomenon. While most commonly associated with Earth, evidence suggests it has played a role in shaping other planets and moons. On Earth, volcanism is primarily linked to the boundaries of tectonic plates, particularly at subduction zones where one plate overrides another, and along oceanic ridges where plates move apart.2