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Describe volcano.

A volcano is simply a rapture (opening or vent) on the earth's surface (crust) through which molten magma (extremely hot mixture of gases, lava, ash and other burning substances) escape on to the earth's surface. 
 

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A volcano is a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapour, and gas are or have been erupted from the earth's crust.
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A volcano is a mountain with a hole 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.
 
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Dear friend,
Here is the answer to your query:
A mountain which is built when molten lava, ash, cinder and dust from the deep inside the earth come out on the surface through cracks on the earth's crust and accumulate is called a volcano or volcanic mountain.
Hope it helps you!
 
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