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ice crystal |
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ice crystal [′īs ‚krist·əl] (physical chemistry) Any one of a number of macroscopic crystalline forms in which ice appears, including hexagonal columns, hexagonal platelets, dendritic crystals, ice needles, and combinations of these forms; although the crystal lattice of ice is hexagonal in its symmetry, varying conditions of temperature and vapor pressure can lead to growth of crystalline forms in which the simple hexagonal pattern is almost undiscernible. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Scientists have found that clouds consisting of a mixture of tiny ice crystals and larger pellets of ice make the most lightning. ON A PEDESTAL--This three-dimensional, simulated ice crystal resembles a common, simple type of natural snowflake: a hexagonal column whose faces are indented because they grow more slowly than the column's edges. Indeed, previous research has shown that the type of ice crystal initially formed, the subsequent modification of the ice crystal as it descends through the cloud and sub-cloud layers, and various surface processes combine to determine SLR. |
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