Which natural hazard is primarily driven by magma movement beneath the Earth's crust?

• A. Volcanoes
• B. Earthquakes
• C. Tsunamis
• D. Floods

Answer: (A)

Movement of magma beneath the Earth's crust powers volcanoes. When magma from the mantle collects and begins to rise, it pushes on surrounding rock, increases internal pressure, and creates pathways toward the surface. If the pressure becomes high enough or cracks form, magma erupts, ejecting lava, ash, and gases. This direct link between subterranean magma movement and surface eruption is why volcanoes are the natural hazard tied to magma dynamics. In contrast, earthquakes arise from rocks breaking under stress, tsunamis come from rapid displacement of large bodies of water (often due to seabed movement or landslides), and floods result from weather and hydrological factors like heavy rain or dam failures. So, the hazard primarily driven by magma movement beneath the crust is volcanoes.