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Volcanoes
Science
| Term | Definition |
|---|---|
| Element | A substance that cannot be broken down into other substances. |
| Viscosity | How thick a substance is. |
| Silica | Makes magma thicker and produces lighter colored lava. |
| Pahoehoe | Thick, slow, lava |
| Aa | Thin, fast, lava |
| Compound | 2 substances mixed togther |
| Lava | Magma when it comes to the surface. |
| Magma | Molten rock that has not reached the surface. |
| Volcanic ash. | Ash the size of dust. |
| Crater | A bowl-shaped geological formation at the top of a volcano |
| Vent | An opening in the earth's crust from which lava, ash, and hot gases flow or are ejected during an eruption. |
| Pipe | Subterranean geological structures formed by the violent, supersonic eruption of deep-origin volcanoes. |
| Lava Flow | A mass of flowing or solidified lava. |
| Extinct | A volcano that has no possibility of becoming active again. |
| Dormant | A volcano that could become active at any moment. |
| Active | A volcano that is erupting. |
| Magma Chamber | A large underground pool of liquid rock found beneath the surface of the Earth. |
| Cinder Cone | A small, flat volcano built of ash and cinders. |
| Shield Volcano | A broad volcano built up from the repeated nonexplosive eruption of basalt to form a low dome or shield |
| Composite Volcano | A large, steep volcano built up of alternating layers of lava and ash or cinders. |
| Subduction | The process by which collision of the earth's crustal plates results in one plate's being drawn down or overridden by another along the border of two plates. |
| Caldera | A large depression resulting from the explosion or collapse of the center of a volcano. |
| Batholith | A large body of intrusive igneous rock believed to have crystallized at a considerable depth below the earth's surface; pluton. |
| Lava Plateau | Formed by highly fluid (runny) basaltic lava during numerous successive eruptions through numerous vents without violent explosions (quiet eruptions) |
| Sill | A body of intrusive igneous rock, ordinarily between beds of sedimentary rocks or layers of molten rock. |
| Dike | A long, narrow, cross-cutting mass of igneous rock intruded into a fissure in older rock. |
| Hot Spring | A long, narrow, cross-cutting mass of rock intruded into a fissure in older rock. |
| Ring of Fire | The linear zone of seismic and volcanic activity that coincides in general with the margins of the Pacific Plate. |
| Geyser | A hot spring that intermittently sends up fountain like jets of water and steam into the air. |
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