Geo test

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Last updated 10:07 AM on 10/3/26
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14 Terms

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extrusive

rocks formed by the freezing of lava above ground. Rapid cooling

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intrusive

rocks formed by the freezing of lava below the ground. slow cooling

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Pluttons

masive bodies of intrusive ingenous rock formed when magma cools and solidifes beneath the Earth’s surface

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crystalline

interlocking crystal

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phanertitic

coarse grained crystals

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aphanitic

fine grained crystals

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porphyritic

large crystals surrounded by fine mass

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pumice

a flesic glassy rock with tiny vesicles

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vesides

fomred by escaping gases

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scoria

a mafic rock with many vescicles

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felsic

high silicia, k-feldspar and quartz

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mafic

less silicia dominated by plagioclase and pyroixene

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batholith

a group of plutons that covers a large area

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