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| type of lava flow that has a jagged blocky surface |
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| lava having a surface of angular blocks associated with material having andesitic and rhyolitic compositions |
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| large depression typically caused by collapse or ejection of the summit area of a volvano |
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| small volcano built primarly of ejected lava fragments that consists of pea to walnut size lapilla |
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| a volcano composed of both lava flows and pyroclastic material |
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| pipelike opening through which magma moves towards earth surface. It terminates at a surface opening called a vent |
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| mountains formed in part by ingenous activity associated with the subduction of oceanic lithosphere beneath a continent |
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| depression at the summit of a volcano, or that which is produced by meterotie impact |
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| buoyant plumes of hot, ash-laden gases that can extend thousands of meters into the atmosphere |
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| a crack in roce along which there is a distinct seperation |
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| an eruption in which lava is extruded from narrow fractures or cracks in the crust |
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| flows of basalt ;ava that issue from numerous cracks or fissures amd commonly cover extensive areas to thickness of hundered of meters |
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| went in a volcanic area from which fumes or gases escape |
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| a submurged, flat top seamount |
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| concentration of heat in the mantle, capable of producing magma that in turn extrudes onto earths surface. The intraplate volcanism that produced the Hawaiian Islands is one example |
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Definition
| igneous activity that occurs within a tectonic plate away from plate boundaries |
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| a chain of volcanic islands generally located a few hundred kilometers from a trench where there is active subduction of one oceanic plate beneath another. |
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| debris flows on the slopes of volcanoes that result when unstable layers of ash and debris become saturated and flow downslope, usually following stream channels. |
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| a bulbous mass associated with an old-age volcano, produced when thick lava is slowly squeezed from the vent. may act as plugs to deflect subsequent gaseous eruptions |
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| tunnel in hardened lava that acts as a horizontal conduit for lava flowing from a volcanic vent. allow fluid lavas to advance great distances |
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Definition
| a mass of hotter-than-normal mantle material that ascends toward the surface, where it may lead to igneous activity |
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| incandescent volcanic debris in an avalanche fashion |
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| a lava flow with a smooth-to-ropy surface |
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| a volcanic cone that forms on the flack of a larger volcano |
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| a vertical conduit through which magmatic materials have passed |
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| A light-colored, glassy vesicular rock commonly having a granitic compostion |
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| a highly heated mixture, largely of ash and pumice fragments, traveling down the flanks of a volcano or along the surface of the ground |
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| the volcanic rock ejected during an eruption. pyroclastics include ash, bombs, and blocks |
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Definition
| vesicular ejecta that is the product of basaltic magma |
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| a rather small volcano built primarily of ejected lava fragments that consist mostly of pea-to walnut-sized lapilli |
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Definition
| a broad, gently sloping volcano built from fluid basaltic lavas |
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Definition
| a volcano composed of both lava flows and pyroclastic material |
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Definition
| the surface opening of a conduit or pipe |
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| a measure of a fluid's resistance to flow |
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| a chain of volcanic islands generally located a few hundred kilometers from a trench where there is active subduction of one oceanic plate beneath another. |
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Definition
| an isloated, steep-sided, erosional remnant consisting of lava that once occupied the vent of a volcano. |
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| a mountain formed from lava and/or pyroclastics |
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Definition
| Gaseous components of magma dissolved in the melt. readily vaporize at surface pressures |
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