sea ice

consolidated pack ice

pack ice in which the floes are frozen together; ice cover 10/10ths.
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congelation ice

an advanced form of new ice that forms as a stable sheet with a smooth bottom surface.
A photograph in natural light of the vertically oriented pores in congelation ice. (Photo courtesy of Ted Maksym, United States Naval Academy.)
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close pack ice

composed of close ice that is mostly in contact; ice cover 7/10ths to 9/10ths.
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bummocks

smooth hills of ice that form on the bottom of sea ice from eroding keels, particularly during the summer melt.
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brine

small droplets of highly saline water that form in pockets between ice crystals, as sea ice forms and expels salt into the underlying ocean water.
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brash ice

accumulation of floating ice made up of fragments not more than 2 meters (6.6 feet) across, the wreckage of other forms of ice.
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blind lead

a lead closed off on all sides within the ice pack.
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bight

an extensive crescent-shaped indentation in the ice edge, formed either by wind or current.
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beset

situation of a vessel surrounded by ice and unable to move.
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belt

a long area of pack ice from a few km to more than 100 kilometers in width.
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