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A volcano is a vent, or opening, in Earthâs surface through which molten rock, gases, and ash erupt. The word also refers to the form or structure, usually conical, produced by accumulations of erupted material.
Report Abuse. A volcano is a mountain where lava (hot, liquid rock) comes from a magma chamber under the ground. Most volcanoes have a volcanic crater at the top. When a volcano is active, materials come out of it. The materials include lava, steam, gaseous sulfur compounds, ash and broken rock pieces.team (water) molten rock Lava and rock fragments this all causes a pyroclastic flow to the person that says pyroclastic flow, pyroclastic flow isn't a material emmitted from the volcano. a pyroclastic flow is what happens using the materials which come out of the volcano.