Term
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Definition
| Rocks originating from the eruption of molten material at the surface |
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Term
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Definition
| Igneous rocks that solidify below the surface |
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Term
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Definition
holes caused my escaping bubbles as magma reaches the surface |
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Term
| Felsic Rocks - Composition |
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Definition
contain: quartz, sodium-rich plagioclase feldspar, and potassium feldspar with very minor dark minerals |
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Term
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Definition
| The resulting rock when magma cools down quickly. Consists of very small crystals |
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Definition
| Felsic volcanic glass with dark gray to black color that seems uncharacteristic of felsic rocks |
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Term
| igneous rock composition catagories (4) |
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Definition
| felsic, intermediate, mafic, ultramafic |
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Term
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Definition
| size of grains in the rock are large enough to be distinguished with the unaided eye as opposed to aphanitic (which is too small to see with the naked eye). This texture forms by slow cooling of magma deep underground in the plutonic environment. |
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Term
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Definition
igneous rock consisting of a mixture of fine and coarse crystals sizes |
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Definition
| The largest pyroclastic fragments |
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Term
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Definition
| intermediate in size fragments (pyroclastic) |
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Term
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Definition
the smallest pyroclastic fragments |
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Term
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Definition
| Phaneritic ultramafic igneous rock; uncommon at the surface but composes the upper mantle |
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Term
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Definition
| Phaneritic, mafic igneous rock |
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Term
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Definition
| Aphanitic mafic igneous rock |
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Term
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Definition
| Aphanitic igneous rock solidified from intermediate-composition magma |
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Term
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Definition
| Phaneritic igneous rock solidified from intermediate-composition magma |
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Term
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Definition
| Phaneritic, felsic igneous rock |
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Term
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Definition
| Aphanitic igneous rock solidified from felsic magma |
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Term
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Definition
| A tabular, steeply inclined igneous intrusion that cuts across sedimentary layers if present |
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Term
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Definition
| a nearly cylindrical pipe of plutonic rock that marks the feeding conduit of of a volcano, and later exposed by erosion |
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Term
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Definition
| relationship of increasing temperature as a function of depth |
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