if rapid-cooling igneous rocks form crystals, why are the crystals dispersed throughout some rocks rather than always forming in clumps?

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if rapid-cooling igneous rocks form crystals, why are the crystals dispersed throughout some rocks rather than always forming in clumps?

In: Earth Science

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Crystals can form in all sorts of cooling regimes. Rapid cooling causes small crystals throughout the mass. Slow cooling allows large crystals to form because the different components have time to migrate and add to a growing crystal of the same chemical type.