Answer: seaice

AnswerCrossword Clue
SEAICENautical hazard
SEAICEGulf of Bothnia winter phenomenon
SEAICEForm of brine
SEAICEHazard of the Northwest Passage.
SEAICEEndangered Arctic presence
SEAICEIt's gradually shrinking in the Arctic
SEAICEWhat grows in the winter
SEAICEMasses of floating brine
SEAICEPolar bear habitat