don't meander to the door
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| volcano | a weak spot in the 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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| lava | liquid magma that reaches the surface
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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 volcanoes that form as the result of subduction of one oceanic plate beneath a second oceanic plate
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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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| magma chamber | the pocket beneath a volcano where magma collects
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| pipe | a long tube through which magma moves from the magma 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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| lava flow | the area covered by lava as it pours out of a volcano's vent
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| crater | 1. a large round pit caused by the impact of a meteoroid 2. a bowl-shaped area that forms around a volcano's central opening
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| silica | a material found in magma that is formed from the elements oxygen and silicon; it is the primary substance of Earth's crust and mantle
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| pyroclastic flow | the flow of ash, cinders, bombs, and gases down the side of a volcano during an explosive eruption
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| dormant | not currently active but able to become active in the future (as with a volcano)
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| extinct | 1. term used to refer to a group of related organisms that has died out and has no living members 2. Term used to describe a volcano that is no longer active and unlikely to erupt again
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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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| cinder cone | a steep, cone-shaped hill or small 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 materials
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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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| volcanic neck | a deposit of hardened magma in a volcano's pipe
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| dike | a slab of volcanic rock formed when magma forces itself across rock layers
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| sill | a slab of volcanic rock formed when magma squeezes between layers of rock
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| batholith | a mass of rock formed when a large body of magma cools inside the crust
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