The rate of cooling because crystals take time to form. Extremely rapid cooling will result in the formation of a noncrystalline rock.More gradual cooling will produce larger crystals in igneous rocks. Microscopic crystals imply a faster rate of form

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1. The rate of cooling because crystals take time to form. Extremely rapid cooling will result in the formation of a noncrystalline rock.More gradual cooling will produce larger crystals in igneous rocks. Microscopic crystals imply a faster rate of form