sea ice

young ice

a general category of ice that represents the transition between nilas and first-year ice; usually 10 to 30 centimeters (4 to 12 inches) thick.
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very open pack ice

pack ice composed of loose, widely spaced floes; ice cover 1/10th to 3/10th.
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very close pack ice

pack ice in which the floes are tightly packed but not frozen together, with very little, if any, sea water visible; ice cover practically 10/10th.
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thermodynamic equilibrium thickness

the thickness at which ice no longer grows because it is so thick that heat from the ocean can no longer be conducted through the ice; it may take several years of growth and melt for ice to reach an equilibrium thickness.
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thaw hole

vertical hole in floating ice formed when a puddle melts through to the underlying water.

telescoped ice

deformed sea ice in which one piece has overridden another; also called rafted ice.
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summer minimum extent

the permanent ice zone that remains in summer after all melting has occurred.
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strip

a long narrow area of pack ice, about 1 kilometer (0.6 mile) or less in width, usually composed of small fragments detatched from the main mass of ice, and run together under the influence of wind or current.
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stamukhi

thick ridges that become grounded during the winter and become part of the fast ice zone; while the rest of the fast ice melts during the summer, a stamukhi remains throughout the summer attached to the ocean bottom.
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slush

a mixture of snow and grease ice.

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