1. drift ice; ice floe
2. Ryuuhyou
Wikipedia definition
3. Drift iceDrift ice is ice that floats on the surface of the water in cold regions, as opposed to fast ice, which is attached ("fastened") to a shore. Usually drift ice is carried along by winds and sea currents, hence its name, "drift ice". When the drift ice is driven together into a large single mass, it is called pack ice. Wind and currents can pile up ice to form ridges three to four metres high, creating obstacles difficult for powerful icebreakers to penetrate.
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