Igneous Rock Pre-Test

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The size of crystals in an Igneous Rock depends upon

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cooling rate (fast vs. slow)

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Rocks that are formed from magma or lava are called

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igneous

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Extrusive rocks are formed

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above the surface of a volcano

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Coarse-grained intrusive igneous rocks with large crystals (like granite) result when

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magma cools slowly

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A common characteristic that could help you identify an igneous rock as cooling on the surface (EXTRUSIVE) is...

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Vesicles (air bubbles) and very small or no crystals

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The most common INTRUSIVE igneous rock is

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granite

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This EXTRUSIVE igneous rock is: granite, basalt, obsidian, pumice

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pumice

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This EXTRUSIVE igneous rock is: obsidian, basalt, pumice, granite

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obsidian

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An igneous rock that is formed from LAVA (OUTSIDE of the volcano) is called...

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Extrusive

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The SLOWER magma cools, the SMALLER the mineral crystals form.

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False