A volcano erupts when hot,sticky rock from inside the Earth bursts through the surface.The hot rock,called lava,pours down the sides of the volcano and over the land.
ALIVE,ASLEEP OR DEAD?
A volcano may be active(alive),dormant(asleep)or extinct(dead).
A volcano that erupts quite often is called an active volcano.
A dormant volcano hasn't erupted for a long time,but may erupt in the future.
And an extinct volcano hasn't erupted for at least a million years.AndSome towns are built on extinct volcanoes.
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