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A volcano is an opening in the Earth's crust that allows molten rock, ash, and gases to escape from below the surface. They are most found where tectonic are either pulling apart pushing together. Volcanic can be , sending high the atmosphere, or they be effusive, gentle of lava. Over time, the accumulation of this erupted material forms the characteristic cone shape we associate with volcanoes. While potentially destructive, volcanoes also create new land and produce highly fertile soil.