Question

what is mean by volcano

Answer 1

A volcano is a mountain that extends down to a pool of magma between the crust and mantle.....
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Answer 2

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A volcano is a mountain that opens downward to a pool of molten rock below the surface of the earth. When pressure builds up, eruption occurs. Gases and rocks shoot up through the opening and spill over or fill the air with lava fragments. Eruption can cause lateral blasts, lava flows, hot ash flows, mudslides, avalanches, falling ash and floods. Volcano eruptions have been known to knock down the entire forests. An erupting volcano can trigger tsunamis, flash floods, earthquakes, mudflows and rockfalls.