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Definition
| a weak spot in the crust where magma has come to the surface |
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Definition
| the molten mixture of rock-forming substances, gases, and water from the mantle |
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Definition
| liquid magma that has reached the surface |
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Definition
| volcano belt that rims the Pacific Ocean |
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Definition
| a string of islands formed by the volcanoes along a deep-ocean trench |
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Definition
| an area where magma from deep within the mantle melts through the crust above it |
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Definition
| the pocket beneath a volcano where magma collects |
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Definition
| a long tube through which magma moves from the magma chamber to Earth's surface |
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Definition
| opening through which magma leaves a volcano |
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Definition
| area covered by lava from a volcano's vent |
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Definition
| a bowl-shaped area that forms around a volcano's central opening |
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Definition
| a material found in magma that is formed from the elements oxygen and silicon |
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Definition
| an explosive volcanic eruption of ash, cinders, bombs, and gases |
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Definition
| a volcano that is not currently active, but that may become active in the future |
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Definition
| a volcano that is no longer active and is unlikely to erupt again |
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Definition
| a fountain of water and steam that builds up pressure underground and erupts at regular intervals |
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Definition
| a wide, gently sloping mountain made of layers of lava; formed by quiet eruptions |
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Definition
| a steep, cone-shaped hill or small mountain made of volcanic ash, cinders, and bombs |
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Definition
| a tall, cone-shaped mountain in which layers of lava and ash alternate |
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Definition
| the large hold at the top of a volcano formed when the roof of a magma chamber collapses |
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Definition
| hardened magma in a volcano's pipe |
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Definition
| a slab of volcanic rock formed when magma forces itself across rock layers |
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Definition
| a slab of volcanic rock formed when magma squeezes between layers of rock |
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Definition
| an igneous rock layer formed when magma hardens beneath Earth's surface |
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Definition
| a mass of rock formed when a large body of magma cools inside the crust |
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Definition
| a broad, bowl-shaped valley formed where the crust is bent downward |
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| the large basin in California between the Coast Ranges and the Sierra Nevada |
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