an opening in The crust that allows hot molten rocks as and gases to escape from below the surface
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Magma
Explanation:
The term volcano also refers to the opening or vent through which the molten rock and associated gases are expelled. Driven by buoyancy and gas pressure the molten rock, which is lighter than the surrounding solid rock forces its way upward and may ultimately break though zones of weaknesses in the Earth's crust.
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