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During a volcanic eruption, magma moves in an upward direction towards the vent of a volcano. The type of eruption depends on the amount of silica and gas. After the eruption, magma touches the earth's surface and is classified as lava. Rocks and other debris in the volcano are forcefully pushed into the air. The rocks are called pyroclastic rocks. When the rocks touch earth, it turns into ash, dust, pummice or cinder.

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