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Crystal size in igneous rocks is generally a marker for how long magma or lava took to cool and solidify. Larger crystal size is indicative of slow cooling.

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What do symmetrical crystal shapes indicate about mineral?

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What is a factor that controls grain size in igneos rocks?

Crystal size in igneous rocks is controlled by the rate of cooling whereby the slower the rate, the larger the size of crystal.


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Which crystal can help identify as igneous rock as intrusive or extrusive?

What is the effect of location on crystal size? Label the location of intrusive and extrusive igneous rocks on the diagram below. Then, illustrate the crystal size of the rock formed at that location in the appropriate callout circles.


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