Terms and there definitions of the word we are learning,
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| Lava | Liquid magma that reaches the surface;also the rock formed when liquid lava hardens.
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| Volcano | A weak spot in the Earth's crust where magma has come to the surface
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| Magma | The molten mixture of rock-forming substances, gases, and water from the mantle.
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| Ring of fire | A major belt of volcanoes that rims the Pacific Ocean.
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| Island arc | A string of islands formed by the volcanoes along a deep ocean trench.
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| Hot spot | An area where magma from deep within the mantle melts through the crust above it.
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| Pipe | A long tube through which magma moves from the chamber to Earth's surface.
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| Vent | The opening through which molten rock and gas leave a volcano.
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| Magma chamber | The pocket beneath a volcano where magma collects.
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| lava flow | The area covered by lava as it pours out of a volcano's vent.
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| crater | A bowl-shaped area that forms around a volcano's central opening.
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| silica | A material that is formed from the elements oxygen and silicon; silica is found in magma.
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| Pahoehoe | A hot, fast-moving type of lava that hardens to form smooth, rope like coils.
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| Aa | A slow-moving type of lava that hardens to form rough chunks; cooler than pahoehoe.
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| pyroclastic flow | The expulsion of ash, cinders, bombs, and gases during an explosive volcanic eruption.
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| active | A volcano that is erupting or has shown signs of erupting in the near future.
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| dormant | A volcano that does not show signs of erupting in the near future sleeping.
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| extinct | A volcano that will not erupt again.
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| hot spring | A pool formed by groundwater that has risen to the surface after being heated by a nearby body of magma.
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| geyser | A fountain of water and steam that builds up pressure underground and erupts at regular intervals.
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| geothermal energy | Energy from water or steam that has been heated by magma.
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| shield volcano | A wide, gently sloping mountain made of layers of lava and formed by quiet eruptions.
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| cinder cone volcano | A steep, cone-shaped hill or mountain made of volcanic ash, Cinders, and bombs piled up around a volcano's opening.
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| composite volcano | A tall, cone-shaped mountain in which layers of lava alternate with layers of ash and other volcanic material.
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| caldera | The large hole at the top of a volcano formed when the roof of a volcano's magma chamber collapses.
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| volcanic neck | A deposit of hardened magma in a volcano's pipe.
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| batholith | A mass of rock formed when a large body of magma cooled inside the crust.
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