A volcano is an opening in the Earth's surface through which melted rock escapes. Far be the gro, temperatures a high eno to me some o the ro, which bec a th liquid cal magma. Because magma is lighter than the solid rock around it, it slowly rises toward the surface. When enough pressure builds up, it may break through and flow out as lava. Some eruptions are quiet, while others are violent and send ash high into the sky.

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