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How can you tell whether an igneous rock has had an intrusive or extrusive origin?

extrusive igneous intrusive origin rock
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How can you tell whether an igneous rock has had an intrusive or extrusive origin?

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An intrusive igneous rock has larger crystals than an extrusive igneous rock. In an extrusive rock the crystals are usually so fined grained that they are not visible by the naked eye. However, the individual crystals in an intrusive igneous rock can be viewed with the naked eye.

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