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| the pocket beneath a volcano where magma collects |
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| a long tube through which magma moves from the magma chamber to Earth's surface |
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| the opening through which molten rock and gas leave a volcano |
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| the area covered by lava as it pours out of a volcano's vent |
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| a bowl-shaped area that forms around a volcano's central opening |
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| a material that is formed from the elements oxygen and silicon |
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| a hot, fast-moving type of lava that hardens to form smooth, ropelike coils |
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| a slow-moving type of lava that hardens to form rough chunks |
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| the expulsion of ash, cinders, bombs, and gases during an explosive volcanic eruption |
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| said of a volcano that is erupting or has shown signs of erupting in the near future |
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| said of a volcano that does not show signs of erupting in the near future |
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| said of a volcano that is unlikely to erupt again |
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| a pool formed by groundwater that has risen to the surface after being heated by a nearby body of magma |
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| a fountain of water and steam that builds up pressure underground and erupts at regular intervals |
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| energy from water or steam that has been heated by magma |
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