Editing Ice (section)

===On lakes{{anchor|Ice_on_lakes}}===
[[File:Candle_Ice.jpg|thumb|300x300px|Candle ice in Lake Otelnuk, [[Quebec, Canada]]]]
Ice forms on calm water from the shores, a thin layer spreading across the surface, and then downward. Ice on lakes is generally four types: primary, secondary, superimposed and agglomerate.<ref>Petrenko, Victor F. and Whitworth, Robert W. (1999) ''Physics of ice''. Oxford: Oxford University Press, pp. 27–29, {{ISBN|0191581348}}</ref><ref>Eranti, E. and Lee, George C. (1986) ''Cold region structural engineering''. New York: McGraw-Hill, p. 51, {{ISBN|0070370346}}.</ref> Primary ice forms first. Secondary ice forms below the primary ice in a direction parallel to the direction of the heat flow. Superimposed ice forms on top of the ice surface from rain or water which seeps up through cracks in the ice which often settles when loaded with snow.  An [[ice shove]] occurs when ice movement, caused by ice expansion and/or wind action, occurs to the extent that ice pushes onto the shores of lakes, often displacing sediment that makes up the shoreline.<ref>{{cite journal |last1=Dionne |first1=J |title=Ice action in the lacustrine environment. A review with particular reference to subarctic Quebec, Canada |journal=Earth-Science Reviews |date=November 1979 |volume=15 |issue=3 |pages=185–212 |doi=10.1016/0012-8252(79)90082-5 |bibcode=1979ESRv...15..185D }}</ref>

[[Shelf ice]] is formed when floating pieces of ice are driven by the wind piling up on the windward shore. This kind of ice may contain large air pockets under a thin surface layer, which makes it particularly hazardous to walk across it.<ref>{{Cite news |last=Schwarz |first=Phil |date=19 February 2018 |title=Dangerous shelf ice forms along Lake Michigan |url=https://abc7chicago.com/3109973/ |work=abc7chicago.com |accessdate=2020-02-05 }}</ref> Another dangerous form of [[rotten ice]] to traverse on foot is candle ice, which develops in columns perpendicular to the surface of a lake. Because it lacks a firm horizontal structure, a person who has fallen through has nothing to hold onto to pull themselves out.<ref>{{Cite encyclopedia|title=Candle ice|encyclopedia=Glossary of Meteorology|publisher=[[American Meteorological Society]]|url=https://glossary.ametsoc.org/wiki/Candle_ice|access-date=2021-03-17|date=2012-02-20}}</ref>