Term
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Definition
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Term
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Definition
| The percent of silicon di oxide in magma |
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Term
| Slow moving, high SiO2, more difficult for gas to escape, more explosive |
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Definition
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Term
| Low SiO2, more fluid, easy for gas to escape, less explosive |
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Definition
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Term
Eruption column formed from
Height
From what type of volcanoes |
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Definition
Plinian eruption
Up to 45 KM
Subduction zone volcanoes |
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Term
| Section of the oceanic crust exposed above sea level by tectonic forces |
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Definition
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Term
| Two types of basalt flows |
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Definition
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Term
| Flow where lava cools to form smooth, ropy texture |
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Definition
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Term
| Lava cools to form rough, blocky texture |
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Definition
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Term
Texture of basalt when eruption is under water.
Forms top layer of ocean crust |
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Definition
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Term
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Definition
| Hot rock fragments and gasses, dry flow |
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Term
| Pyroclastic Flow occur in |
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Definition
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Term
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Definition
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Term
| Source of prosylactic flow |
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Definition
| Collapse of eruption column |
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Term
| Rapidly flowing mixture of pyroclasts and water, originate from the melting of ice, rainfall or the breakout of a lake |
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Definition
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Term
| Viscous lava solidifies in the caldera (or crater) of a composite volcano. |
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Definition
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Term
| Tall Eruption Column, go into stratosphere |
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Definition
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Term
| Large volume of basaltic lava erupting on surface |
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Definition
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Term
| Alternating layers of pyroclasts and lava flows. (Subduction zone volcanoes- Ring of Fire), Explosive Eruptions |
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Definition
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Term
| Major gasses emitted from volcanoes and percentage |
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Definition
Water vapor 50 percent
CO2
Sulfer dioxide |
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Term
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Definition
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Term
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Definition
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Term
3 tectonic settings w/ volcanic activity
Most common lava types erupting at each |
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Definition
Divergent plate boundaries (both types)
Subduction zones (sheild and composite)
Hot spots: source mantle plumes |
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Term
| Most active volcano on Hawaii and in the world |
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Definition
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Term
| Mt. St. Helens and Mt. Rainer location and what is hazard |
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Definition
Cascade arc
Lahars will be serious hazards |
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Term
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Definition
| Indonesia's most active volcano in erupted in October 2010 |
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Term
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Definition
Part of indonesian volcanic arc, largest eruption in history
Global cooling and year without summer, blocked sun |
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