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Volcanoes are a mountains or hills, typically conical, that has a crater or a vent through which lava, rock fragments, gas and hot vapor are able to escape and erupt from inside the Earth's crust. A volcano can be any rupture in the Earth's crust that allows volcanic ash and gas to escape from it. Cinder cone volcanoes are the simplest types of volcano. Composite volcanoes make up the world's most memorable mountains including Mount Rainier and Mount Fuji.