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A volcano is a geological landform, often a mountain, where molten rock, ash, and hot gases escape from below the Earth's surface. eruptions occur magma, is rock the Earth, rises and builds up pressure. pressure forces magma weaknesses or vents the 's crust. While volcanic eruptions can be highly destructive, they also play a creative role in nature. The ash and lava they deposit break down over time to form incredibly fertile soil.