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| A substances resistance to flow. |
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| An opening In the surface of earth through which molten rock and gases release. |
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| Volcanic rock ejected during an eruption, including ash, bombs and blocks |
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| Mountain formed of lava and/or pyroclastic material |
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| The depression at the summit of a volcano or that which is produced by a meteorite impact |
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| A broad gently sloping volcano built from fluid basaltic lavas |
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| A small volcano built primarily of pyroclastic material ejected from a single area of a volcano |
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| A volcano composed of both lava flows and pyroclastic material |
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| A large depression typically caused by collapse or ejection of the summit area of a volcano |
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| An intrusive igneous structure that results from the cooling and hardening of magma beneath surface of earth |
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| A tabular igneous body formed when magma is injected along sedimentary bedding surfaces |
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| A massive igneous body intruded between preexisting strata |
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| A tabular shaped intrusive igneous Rick feature that occurs when magma is injected into fractures in the surrounding rock, cutting across preexisting rock layers |
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| A large mass of igneous rock that formed when magma intruded at depth became crystallized and subsequently was exposed by erosion; they have a surface exposure greater than 100 sq km |
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| Gradual increase in temp with depth in the crust; average is 30 degrees Celsius per km in upper crust |
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| Melting due to a drop in confining pressure that occurs as rock rises |
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| Igneous activity that occurs within a tectonic plate away from plate boundaries |
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