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Volcanoes are opening, or rupture, in the surface or crust of the Earth or a planetary mass object, which allows hot lava, volcanic ash and gases to escape from the magma chamber below the surface.
Added 3/10/2014 4:19:23 PM
This answer has been confirmed as correct and helpful.
Confirmed by
alfred123 [3/10/2014 4:22:17 PM]