| 1. | | A bowl- shaped area that forms around a volcano's central opening |
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| 2. | | A deposit of hardened magma in a volcano's pipe. |
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| 3. | | A long tube through which magma moves from the magma chamber to Earth's surface |
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| 4. | | A major belt of volcanoes that rims the Pacific Ocean |
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| 5. | | A mass of rock formed when a large body of magma cools inside the crust. |
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| 6. | | A material that is formed from the elements oxygen and silicon; it's the primary substance of Earth's crust and mantle. |
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| 7. | | A slab of volcanic rock formed when magma forces itself across rock layers. |
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| 8. | | A slab of volcanic rock formed when magma squeezes between layers of rock. |
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| 9. | | 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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| 10. | | A string of volcanoes that form as the result of subduction of one oceanic plate beneath a second oceanic plate. |
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| 11. | | A tall, cone-shaped mountain in which layers of lava alternative with layers of ash, and other volcanic materials. |
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| 12. | | A volcano that is no longer active and unlikely to erupt again. |
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| 13. | | A weak spot in the crust where magma has come to the surface |
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| 14. | | A wide, gently sloping mountain made of layers of lava and formed by quiet eruptions. |
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| 15. | | An area where magma from deep within the mantle melts through the crust above it |
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| 16. | | Magma that reaches the surface; also the rock formed when liquid lava hardens |
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| 17. | | Not currently active but able to become active in the future. |
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| 18. | | The area covered by lava as it pours out of a volcano's vent |
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| 19. | | The flow of ash, cinders, bombs, and gases down the side of a volcano during an explosive eruption. |
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| 20. | | The large hold at the top of the volcano formed when the roof of a volcano's magma chamber collapses. |
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| 21. | | The molten mixture of rock- forming substances, gases, and water that makes up a part of the earth's mantle |
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| 22. | | The opening through which molten rock and gas leave a volcano. |
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| 23. | | The pocket beneath a volcano where magma collects |
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