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Intrusive and Extrusive Igneous Rocks loading

Intrusive rocks cool slowly and extrusive igneous rocks cool rapidly; this leads to different crystal sizes.

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    Intrusive and Extrusive Igneous Rocks

    Intrusive and Extrusive Igneous Rocks

    by CK-12 //basic
    Determination of intrusive and extrusive igneous rocks.
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  • Video
    Igneous Rocks

    Igneous Rocks

    by CK-12 //basic
    Gives an overview of igneous rocks.
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  • Real World Application
    Devil's Den

    Devil's Den

    by CK-12 //basic
    The geology of Gettysburg influenced the outcome of battles during the Battle of Gettysburg. The boulders of Devil's Den were good hiding places.
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  • Real World Application
    Stone Tools

    Stone Tools

    by CK-12 //basic
    Obsidian is hard and sharp. Humans used obsidian to make sharp and sturdy tools.
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