Molten Lava Flowing From Eyjafjallajokull Fimmvorduhals Iceland A volcano is a mountain that has an opening on top that leads to a pool of molten rock in the earth.

When there is too much pressure in the pool, the volcano will erupt!

When the eruption happens, molten lava will flow from the volcano.

People staying near an erupting volcano have to quickly run to safety.

There are volcanoes under the sea!


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