Volcanoes.
A Volcano is a vent in the earth's crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervals.
It iso also a mountain or hill, usually having a cuplike crater at the summit, formed around such a vent from the ash and lava expelled through it.
It iso also a mountain or hill, usually having a cuplike crater at the summit, formed around such a vent from the ash and lava expelled through it.
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