| Summary: | By far the most common form of ice covering a body of water is "sheet ice". Wilson Zumberge and Marshall (1) have recently done a classification of lake ice and reported that two basic structures were found: i) a coarsely crystalline columnar aggregate, ii) a finely crystalline granular aggregate. This crystalline granular aggregate is produced by the affects of heavy snow fall at the time of freeze-up or by snow fall on the ice surface which, by a process of wet and dry snow metamorphism, changes into the granular aggregate, forming a miner portion of the ice sheet.
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