12.3 and 12.4
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14 terms
Terms | Definitions |
|---|---|
 Volcano | an opening in earth;s crust that allows pyroclastic materials to escape from earth |
| Volcanic Dome | rounded, steep-sided mounds built by magma that is highly resistant to flow |
| Vent | openings in Earth's crust from which magma and volcanic gases escape to ground or atmosphere |
| Lava | masses of magma that pour onto Earth's surface during an effusive eruption |
| Ash | rock, mineral, and volcanic glass fragments, smaller than a tenth of an inch, that are created by a volcanic eruption |
| Tephra | fragments of volcanic rock and lava that are blasted into the air by explosions are carried upward by hot gases in an eruption |
| Lahar | a rapidly flowing mixture of rock debris and water that originates on the slopes of a volcano |
| Gas | pressure that causes magma to erupt from a volcano (carbon dioxide, water vapor, and sulfur dioxide) |
| Pyroclastic Flow | any volcanic fragment that was hurled through the air by volcanic activity |
| Viscosity | a liquid's tendency to resist flow |
| Crust | silicon, aluminum, calcium, sodium, and potassium |
| Mantle | silicon, oxygen, magnesium, iron, aluminum, and calcium |
| Outer Core | iron, nickle |
| Inner Core | iron, nickle, inside |
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