Understanding Igneous Rocks

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Igneous Rocks

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Formed from cooled magma or lava

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Magma

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Molten rock beneath Earth's surface

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Lava

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Molten rock on Earth's surface

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Intrusive Igneous Rocks

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Formed inside Earth, cool slowly

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Extrusive Igneous Rocks

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Formed on surface, cool quickly

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Granite

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Example of intrusive igneous rock

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Basalt

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Example of extrusive igneous rock

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Crystal Size

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Larger in intrusive, smaller in extrusive

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Cooling Rate

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Slow for intrusive, fast for extrusive

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Igneous Rock Uses

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Building materials, sculptures