Term
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Definition
| Magma that erupts explosively. |
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Term
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Definition
SiO2 Content: 66-76%
Feldspar/Rhiolite
Silica Rich |
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Term
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Definition
SiO2 Content: 52-66%
Diorite |
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Term
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Definition
SiO2 Content: 45-52%
Basalt/Gabbros
Iron Rich |
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Term
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Definition
SiO2 Content: 38-45%
Peridotite
Mantle Rock |
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Term
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Definition
| Gases(primarily water vapor) constitute only a small percent of magmas. |
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Term
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Definition
Angular fragments.
Pyroclastic |
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Term
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Definition
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Term
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Definition
| Interconnecting mass from underwater eruption of basaltic lavas |
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Term
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Definition
| Lava flow ceased & left a long cave-like channel |
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Term
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Definition
| Formed by cooling & contraction of lava, most common in basalt & andesite lava flow. |
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Term
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Definition
| circular volcanic depression that forms when the summit of a volcano collapses into its magma chamber |
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Term
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Definition
| Non-explosive; Gentle Slope |
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Term
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Definition
Cinder cone volcanoes consist of:
Cinder-like pyroclastic materials accumulated as small steep-sloped cones |
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Term
| Composite (Strato) Volcanoes |
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Definition
Consist of layers of lava flows, pyroclastic debris, and volcanic mud flows(lahars).
Most Dangerous |
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Term
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Definition
| Volcanic Explosivity Index |
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Term
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Definition
| Transformation of rocks without melting |
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Term
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Definition
| Oldest part of continental crust |
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Term
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Definition
| Heat, Pressure, Fluid Activity |
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Term
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Definition
| Lithostatic & Differential |
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Term
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Definition
| Metamorphic Fluids include water vapor & cO2 |
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Term
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Definition
High Temperature & Low Presure
Aureoles (baked zones) occur around magmas |
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Term
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Definition
| Rocks are ground and crushed in faults |
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Term
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Definition
Most common;Broad Range;
Temp & pressure act as driving forces |
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Term
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Definition
| Degree of metamorphic change a rock has undergone |
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Term
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Definition
| Certain minerals are only known to form under specific ranges of metamorphic temp & pressure. |
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Term
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Definition
Produced by preffered orientation of platy minerals due to pressure
(slate,schist, gneiss) |
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Term
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Definition
Randomly Oriented
Limestone->Marble, Quartz Sandstone->Quartzite |
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