Which statement best describes the distribution of volcanic activity?

• A. Volcanoes are evenly distributed around the globe
• B. Volcanoes are concentrated near the equator
• C. Volcanoes are rare at plate margins
• D. The majority occur in long belts at plate margins

Answer: (D)

Volcanic activity is tightly linked to plate tectonics, with magma generation and ascent concentrated where plates interact. Most eruptions occur along long belts at plate margins—the boundaries where plates collide, slide past, or pull apart—creating extensive zones of volcanism such as the Pacific Ring of Fire and other circum-Pacific and Mediterranean-Asian belts. There are some volcanoes formed far from margins by hot-spot processes, but these are far fewer in number compared with belt-associated volcanoes. So the global pattern is dominated by volcanism along plate boundaries, rather than being evenly spread or concentrated near the equator.