sea ice

floating ice

any form of ice found floating in water.

flaw lead

a navigable passage between pack ice and fast ice.
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first-year ice

floating ice of no more than one year's growth developing from young ice; thickness from 0.3 to 2 meters (1 to 6.6 feet); characteristically level where undisturbed by pressure, but where ridges occur, they are rough and sharply angular.
(Photo courtesy of Ted Maksym, United States Naval Academy.)
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finger rafting

a process by which currents or winds push around thin ice so they slide over each other.
Nilas showing finger rafting. (Photo courtesy of Antarctic Sea-Ice Processes and Climate (ASPeCt).)
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fast ice

ice that is anchored to the shore or ocean bottom, typically over shallow ocean shelves at continental margins; fast ice is defined by the fact that it does not move with the winds or currents.
Note: This is land fast ice. (Photo courtesy of Michael Van Woert, National Oceanic and Atmospheric Administration/Department of Commerce.)
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drifting stations

research stations on the floes of the arctic ocean.

drift of ice

displacement of a sea ice field from its place of origin under the effect of ocean currents and winds.

drift ice

ice that moves from winds, currents, or other forces.
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dirty ice

ice that contains sediments stirred up and tangled in the ice as it grows.
(Photo courtesy of Terry Whitledge, National Oceanic and Atmospheric Administration/Department of Commerce.)
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crack

any fracture or rift in floating ice not sufficiently wide to be described as a lead.
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