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12 Cards in this Set
- Front
- Back
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intrusive
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Rock formed by the freezing of magma underground
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extrusive
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Rock that forms by the freezing of lava above ground, after it flows or explodes out onto the surface and comes into contact with the atmosphere or ocean.
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magma
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Molten rock beneath the earth’s surface
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lava
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Molten rock that has flowed out onto the Earth’s surface
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mafic
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A term used in reference to magmas or igneous rocks that are relatively poor in silica and rich in iron and magnesium.
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felsic
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An adjective used in reference to igneous rocks that are rich in elements forming feldspar and quartz
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plutons
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irregular or blob shaped intrusions that range is size from ten meters across to ten kilometers across
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dike
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A tabular (wall shaped) intrusion of rock that cuts across the layering of country rock
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sill
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A nearly horizontal table top shaped tabular intrusion that occurs between the layers of country rock
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phaneritic
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A texture term used to describe coarse grained igneous rock
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aphanitic
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A texture term for fine grained igneous rock
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porphyritic
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A textural form for igneous rocks that has phenocrysts distributed through a finer matrix
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