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The rate of nucleation is much more sensitive to temperature than the rate of crystal growth. At high temperatures, more molecules have enough energy to overcome the energy barrier to nucleation, so more nuclei are formed. This can lead to the formation of many small crystals, which can then grow into larger crystals over time. In contrast, at low temperatures, fewer molecules have enough energy to overcome the energy barrier, so fewer nuclei are formed. This can lead to the formation of fewer, larger crystals.