Why are the igneous rock in the fine-grained smooth and compact a may have large crystals with coarse texture.
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The texture of an igneous rock (fine-grained vs coarse-grained) is dependent on the rate of cooling of the melt: slow cooling allows large crystals to form, fast cooling yields small crystals. ... Very quickly cooled lavas, typically those quenched in water, will have a glassy texture.
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safei have no answer sorry .
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